Η επαφή με τη φίλη μου στην Ελλάδα με βοηθάει να μιλάω καλύτερα.

Η is the feminine singular definite article, meaning the.

• η επαφή = the contact
• The noun επαφή is feminine, so it takes η in the nominative singular.

So the sentence begins with The contact...

In this sentence, επαφή means contact in the sense of being in touch with someone.

So Η επαφή με τη φίλη μου means something like:

• My contact with my friend
• Being in touch with my friend

It is not physical contact here. It refers to communication or ongoing connection.

The two με words do different jobs.

1. με τη φίλη μου
   Here με means with.

   • επαφή με τη φίλη μου = contact with my friend

2. με βοηθάει
   Here με is the object pronoun me.

   • με βοηθάει = helps me

So even though both are spelled με, they mean different things:

• με = with
• με = me

Greek does this often, so context tells you which one it is.

Because after με meaning with, the noun must be in the accusative case.

• Nominative: η φίλη μου = my friend as the subject
• Accusative: τη φίλη μου = my friend after a preposition like με

So:

• η φίλη μου με βοηθάει = my friend helps me
• με τη φίλη μου = with my friend

Both τη and την are correct forms of the feminine accusative article.

Before some words, especially in modern speech and writing, the final -ν is often dropped:

• την φίλη μου
• τη φίλη μου

Both mean the same thing.
τη φίλη μου is very common and natural.

In Greek, possessive pronouns like μου (my) usually come after the noun.

So:

• η φίλη μου = my friend
• literally: the friend of me

This is normal Greek word order.
You do not usually put μου before the noun the way English puts my before friend.

στην is a contraction of σε + την.

• σε = in / at / to
• την = the (feminine accusative)

So:

• σε την Ελλάδα → στην Ελλάδα

This means in Greece.

This contraction is extremely common in Greek:

• στο = σε + το
• στη / στην = σε + τη(ν)
• στους, στις, etc.

Because the preposition σε takes the accusative in Modern Greek.

So even though English says in Greece, Greek uses:

• στην Ελλάδα

The base form is:

• η Ελλάδα = Greece (nominative)
• την Ελλάδα = Greece (accusative)

After σε, you use the accusative form.

It tells you more about the friend: this is my friend in Greece.

So the structure is:

• τη φίλη μου στην Ελλάδα = my friend in Greece

In other words, στην Ελλάδα is attached to friend, not to contact or helps.

Greek word order is flexible, but here this placement is the most natural way to show that the friend is the one in Greece.

βοηθάει means helps.

Yes, βοηθάει and βοηθά are both used in Modern Greek.

• με βοηθάει
• με βοηθά

Both mean it helps me.

βοηθάει is very common in everyday speech and writing.
βοηθά is slightly shorter but equally correct.

Because Greek normally uses να before a verb in this kind of structure.

• με βοηθάει να μιλάω καλύτερα = it helps me speak better

The pattern is:

• βοηθάω κάποιον να + verb

So να is required here. It introduces the action that follows.

After να, Greek uses what learners often call the subjunctive structure.

So:

• να μιλάω = to speak / that I speak

In this sentence, να μιλάω expresses the action that the contact helps with.

Also, μιλάω is an imperfective/present-type form, which fits the idea of an ongoing ability or repeated action:

• speaking better in general
• not just speaking once

Yes. Both are correct.

• να μιλάω
• να μιλώ

These are two common forms of the same verb to speak.

Usually:

• μιλάω sounds more everyday and conversational
• μιλώ can sound a bit more formal or concise

In this sentence, να μιλάω καλύτερα sounds very natural.

Because καλύτερα is an adverb, while καλύτερος is an adjective.

Here it describes how someone speaks:

• μιλάω καλύτερα = I speak better

Since it modifies the verb μιλάω, you need the adverb καλύτερα.

Compare:

• είναι καλύτερος μαθητής = he is a better student
  Here καλύτερος describes a noun, so it is an adjective.

Yes. The subject is Η επαφή με τη φίλη μου στην Ελλάδα.

That whole noun phrase is what helps me.

So the basic structure is:

• Η επαφή ... με βοηθάει ...
• The contact ... helps me ...

Even though φίλη μου is inside the phrase, friend is not the grammatical subject here.
The subject is the contact.

Yes. Greek usually does not need an explicit subject pronoun like I.

The ending of the verb often shows the person:

• μιλάω = I speak

So να μιλάω καλύτερα already contains the idea for me to speak better or to speak better.

That is why there is no separate Greek word for I here.

Greek word order is flexible, but this version is very natural:

• Η επαφή με τη φίλη μου στην Ελλάδα με βοηθάει να μιλάω καλύτερα.

You could move things around for emphasis, but not all versions sound equally natural.

For example, this is also possible:

• Με βοηθάει να μιλάω καλύτερα η επαφή με τη φίλη μου στην Ελλάδα.

That puts more emphasis on what helps me.

So yes, Greek allows movement, but the original sentence is a normal, neutral order.