Jika konsentrasi saya hilang, saya menutup gawai dan menarik napas dalam-dalam.

• jika = if (more neutral/formal, clearly conditional)
• kalau = also if, but more informal and very common in speech
• ketika / saat = when (focus on time, not on condition)

In your sentence:

Jika konsentrasi saya hilang, saya menutup gawai dan menarik napas dalam-dalam.
If my concentration disappears, I close my device and take a deep breath.

• jika konsentrasi saya hilang → general condition (whenever that happens)
• kalau konsentrasi saya hilang → same meaning, more casual
• ketika / saat konsentrasi saya hilang → grammatically okay, but sounds more like describing a specific moment in time than a general “if X, I do Y” rule.

For a general habit, jika (neutral/formal) or kalau (casual) is more natural than ketika / saat.

Indonesian usually doesn’t need a linking verb like “is” between a subject and an adjective or a state.

• konsentrasi saya hilang literally: my concentration gone
  → understood as my concentration is gone / disappears.

You cannot use adalah here:

• ✖ konsentrasi saya adalah hilang (unnatural / wrong)

adalah is mainly used before nouns or noun phrases, not adjectives or verbs:

• Dia adalah dokter. = He/She is a doctor.
• Masalahnya adalah biaya. = The problem is the cost.

hilang can function both as:

• a stative verb = to disappear / to be lost
• an adjective-like word = gone / missing

In konsentrasi saya hilang, it means:

• “my concentration disappears / is gone / is lost”

So the clause is complete without any extra verb. It’s like saying “my concentration disappears” in English.

Both are correct, but there’s a nuance:

1. konsentrasi saya hilang

   • Focus on the concentration as something that “goes away”.
   • Slightly more neutral, descriptive.

2. saya kehilangan konsentrasi

   • Literally: I lose concentration.
   • Focus on me as the experiencer.
   • Slightly more “active” sounding.

In your sentence, both work:

• Jika konsentrasi saya hilang, ...
• Jika saya kehilangan konsentrasi, ...

They mean almost the same; the second sounds just a bit more like you’re describing your own experience actively.

Indonesian usually expresses “X of Y” as:

• [thing] + [possessor]
  → konsentrasi saya = my concentration
  → buku saya = my book
  → rumah mereka = their house

saya konsentrasi is not a noun phrase. It would be interpreted as:

• saya konsentrasi = I concentrate / I am concentrating (verb usage)

So for “my concentration”, you need konsentrasi saya, not saya konsentrasi.

Yes, you can drop saya in the second clause if the subject is clear from context:

• Jika konsentrasi saya hilang, saya menutup gawai dan menarik napas dalam-dalam.
• Jika konsentrasi saya hilang, menutup gawai dan menarik napas dalam-dalam. (subject is understood as “I”)

The full version with saya is slightly clearer and more formal/written.
In everyday speech, dropping repeated subjects is very common when there’s no ambiguity.

Literally:

• menutup = to close
• gawai = device / gadget (electronic gadget)

In real usage, menutup gawai is a bit vague. It could mean:

• putting it away
• closing what you’re doing on the screen
• sometimes loosely “turning it off”

More specific and common options in daily speech:

• mematikan HP / ponsel = turn off the phone
• mengunci layar = lock the screen
• menaruh HP / ponsel = put the phone down

Also, in casual conversation people often say HP or handphone, not gawai:

• Saya menutup HP dan menarik napas dalam-dalam.
• Saya taruh HP lalu tarik napas dalam-dalam.

gawai is understood and used more in:

• media, formal writing, and more careful speech
• contexts where you want a neutral, Indonesian-sounding term

In everyday conversation, especially in cities, you’ll hear more:

• HP (pronounced: ha-pe) = cellphone (very common)
• handphone = same as HP, casual
• ponsel = mobile phone, a bit more formal than HP

So a natural everyday version might be:

• Jika konsentrasi saya hilang, saya menutup HP dan menarik napas dalam-dalam.
• or ... saya taruh HP dan menarik napas dalam-dalam.

Both exist, but they’re used differently:

• bernapas = to breathe (general action)

  • Saya bernapas. = I breathe / I am breathing.

• menarik napas = to take a breath (literally “pull breath in”)

  • Focuses on the inhalation as a deliberate action.

For “take a deep breath”, Indonesian normally says:

• menarik napas dalam-dalam
• or tarik napas dalam-dalam (without meN-, as a command)

So your sentence uses the usual natural collocation.

dalam-dalam is reduplication of dalam (deep) and here it works as an adverb meaning “deeply”.

• napas dalam-dalam = a deep breath / breathing deeply

Nuance:

• napas dalam-dalam → typical, idiomatic, sounds very natural
• napas sangat dalam → understandable, but less idiomatic as a fixed phrase
• napas dalam sekali → also OK, “very deep breath”, but again less formulaic

For “take a deep breath”, tarik / menarik napas dalam-dalam is the standard, set expression.

Indonesian doesn’t mark tense the way English does. Time is usually inferred from:

• context
• time words (sekarang, kemarin, besok, tadi, nanti, etc.)
• aspect markers (sudah, belum, sedang, akan, etc.)

Your sentence without anything else is understood as a general habit:

• Jika konsentrasi saya hilang, saya menutup gawai dan menarik napas dalam-dalam.
  → Whenever my concentration disappears, I (usually) close my device and take a deep breath.

If you wanted a more future-like feeling, you could add akan:

• Jika konsentrasi saya hilang, saya akan menutup gawai...
  → more like If my concentration disappears, I will close my device...

Both mean “I / me”:

• saya = polite, neutral, widely acceptable in almost any situation
• aku = more informal / intimate, used with friends, family, close peers

In a neutral sentence without context, saya is a safe default.
You could say:

• Jika konsentrasi aku hilang, aku menutup gawai dan menarik napas dalam-dalam.

This is grammatically fine, but sounds more casual and personal. The important thing is consistency: don’t mix saya and aku in the same text or conversation unless you have a reason.

The standard pattern is:

• [subordinate clause], [main clause].
  → Jika konsentrasi saya hilang, saya menutup gawai dan menarik napas dalam-dalam.

In formal writing, that comma is recommended. In casual writing (texts, chats), some people omit it:

• Jika konsentrasi saya hilang saya menutup gawai dan menarik napas dalam-dalam.

It’s still understandable, but the comma makes the sentence clearer and is preferred in correct written Indonesian.