احتمالا بعد از کمی استراحت، دوباره روی پروژه کار میکنم.

Because Persian verbs usually already show the subject.

Here, می‌کنم means I do / I work. The -م ending tells you the subject is I.

So:

• کار می‌کنم = I work / I’m working
• کار می‌کنی = you work
• کار می‌کند = he/she works

You can add من if you want emphasis:

• من احتمالا بعد از کمی استراحت، دوباره روی پروژه کار می‌کنم.

But in normal speech, Persian often leaves the subject pronoun out.

احتمالا means probably.

Yes, its position is very natural. Persian adverbs like this are fairly flexible, but putting احتمالا near the beginning of the sentence is common.

So this is natural:

• احتمالا بعد از کمی استراحت، دوباره روی پروژه کار می‌کنم.

You could also say:

• بعد از کمی استراحت، احتمالا دوباره روی پروژه کار می‌کنم.

Both are fine, with only a slight shift in emphasis.

Also, in more formal writing you may see احتمالاً with the final اً, but in everyday writing احتمالا is very common.

This is very common in Persian.

The form می‌کنم is grammatically a present-tense form, but Persian often uses the present to talk about the near future or intended future, especially when the context already makes the future meaning clear.

In this sentence, the future sense comes from words like:

• بعد از = after
• احتمالا = probably
• دوباره = again

So Persian does not need a special future form here.

A more explicitly future version would be:

• احتمالا بعد از کمی استراحت، دوباره روی پروژه کار خواهم کرد.

That is correct, but in everyday spoken Persian, the original sentence with کار می‌کنم sounds more natural.

Because کار کردن is a compound verb meaning to work.

In Persian, many verbs are made of:

• a noun or other element
• plus a light verb such as کردن

So here:

• کار = work
• کردن = to do
• کار کردن = to work

When you conjugate it, the می- goes with the light verb:

• کار می‌کنم = I work

This is important because می‌کنم by itself usually just means I do.

Also, don’t confuse this with می‌کارم, which is from another verb and means I plant.

In standard Persian spelling, it is normally written with a half-space:

• می‌کنم

In casual typing, many people write:

• میکنم

That is very common online, but the standard written form is می‌کنم.

So in careful writing, the sentence is best written as:

• احتمالا بعد از کمی استراحت، دوباره روی پروژه کار می‌کنم.

It breaks down like this:

• بعد از = after
• کمی = a little / some
• استراحت = rest

So:

• بعد از کمی استراحت = after a little rest / after resting a bit

A useful point: کمی before a noun often means a little bit of or some.

Examples:

• کمی آب = some water
• کمی وقت = a little time
• کمی استراحت = a little rest

In more casual spoken Persian, you might also hear:

• بعد از یه کم استراحت

That means the same thing, but sounds more conversational.

دوباره means again.

It tells us the speaker will return to the project after resting.

Its placement is fairly flexible. In your sentence, it appears before روی پروژه کار می‌کنم, which is very natural:

• احتمالا بعد از کمی استراحت، دوباره روی پروژه کار می‌کنم.

You could also hear:

• احتمالا دوباره بعد از کمی استراحت روی پروژه کار می‌کنم.
• بعد از کمی استراحت، دوباره روی پروژه کار می‌کنم.

The exact position can slightly change what gets emphasis, but the meaning stays similar.

Because Persian commonly uses روی with کار کردن to mean work on something.

So:

• روی پروژه کار کردن = to work on a project
• روی این موضوع کار کردن = to work on this issue/topic

Literally, روی often means on, and in this expression it matches English quite well.

A more formal alternative is:

• بر روی پروژه کار می‌کنم

But in everyday speech, روی پروژه is much more natural.

Also note that رو is the colloquial spoken form of روی:

• رو پروژه کار می‌کنم

That is common in speech and informal writing.

Because پروژه is not the direct object here.

In this sentence, پروژه is part of the prepositional phrase:

• روی پروژه = on the project

The marker را is used for direct objects, not after prepositions.

So:

• کتاب را می‌خوانم = I read the book
  here کتاب is a direct object

But:

• روی پروژه کار می‌کنم = I work on the project
  here پروژه comes after روی, so no را

A rough pronunciation guide is:

ehtemâlan ba'd az kami esterâhat, dobâre ru-ye proje kâr mikonam

A few notes:

• احتمالا ≈ ehtemâlan
• استراحت ≈ esterâhat
• دوباره ≈ dobâre
• روی ≈ ru-ye
• پروژه ≈ pro-zhe
• می‌کنم ≈ mikonam

In normal speech, some parts may sound a bit shorter or smoother, especially روی and می‌کنم.

This sentence is neutral and natural. It works well in everyday spoken and written Persian.

A few variations:

More formal spelling

• احتمالاً بعد از کمی استراحت، دوباره روی پروژه کار می‌کنم.

More colloquial

• احتمالاً بعد یه کم استراحت، دوباره رو پروژه کار می‌کنم.

More explicitly future

• احتمالاً بعد از کمی استراحت، دوباره روی پروژه کار خواهم کرد.

All of these are correct. The original version is probably the most natural choice for ordinary conversation.