Το προσχέδιο δεν είναι τέλειο ακόμα, αλλά τουλάχιστον δεν είμαι πια τόσο ανήσυχος όσο χτες.

Προσχέδιο is a neuter noun, so it takes the neuter definite article το.

• το προσχέδιο = the draft
• Singular, nominative/accusative

Many Greek nouns have fixed grammatical gender, and adjectives that describe them have to match that gender too. That is why later you get τέλειο and not τέλειος.

Because τέλειο agrees with το προσχέδιο, which is neuter singular.

Greek adjectives change form to match the noun they describe:

• masculine: τέλειος
• feminine: τέλεια
• neuter: τέλειο

So:

• το προσχέδιο είναι τέλειο
• ο άνθρωπος είναι τέλειος
• η ιδέα είναι τέλεια

Here ακόμα means yet / still, depending on how you think about it in English.

In this sentence:

• δεν είναι τέλειο ακόμα = it isn’t perfect yet

With a negative, ακόμα often corresponds to yet in English. In other contexts it can also mean still or even even.

Examples:

• Δεν έχω φύγει ακόμα. = I haven’t left yet.
• Ακόμα περιμένω. = I’m still waiting.

Because the subject changes.

First part:

• Το προσχέδιο δεν είναι τέλειο ακόμα
  The subject is the draft, so Greek uses είναι = is

Second part:

• αλλά τουλάχιστον δεν είμαι πια τόσο ανήσυχος...
  The subject is I, so Greek uses είμαι = am

So the sentence moves from talking about the draft to talking about the speaker’s feelings.

Τουλάχιστον means at least.

Here it softens or balances the first statement:

• The draft isn’t perfect yet, but at least I’m not as worried as yesterday.

It is quite flexible in position, though some placements sound more natural than others:

• αλλά τουλάχιστον δεν είμαι...
• αλλά δεν είμαι τουλάχιστον... → possible, but less natural here
• τουλάχιστον, δεν είμαι... → also possible

In this sentence, putting it right after αλλά sounds very natural.

Πια means any longer / anymore / now depending on context.

In this sentence:

• δεν είμαι πια τόσο ανήσυχος = I’m no longer / not anymore so worried

It often appears with negatives to show that something used to be true but is no longer true.

Examples:

• Δεν μένω πια εκεί. = I don’t live there anymore.
• Δεν τον βλέπω πια. = I don’t see him anymore.

So ακόμα and πια are doing different jobs here:

• ακόμα = not yet
• πια = no longer / anymore

This is the standard Greek pattern for as ... as comparisons.

• τόσο ανήσυχος όσο χτες = as worried as yesterday

Structure:

• τόσο = so / as much
• adjective or adverb
• όσο = as

More examples:

• Είναι τόσο ψηλός όσο ο αδερφός του. = He is as tall as his brother.
• Δεν τρέχω τόσο γρήγορα όσο εσύ. = I don’t run as fast as you.

So if an English speaker wants to say not as X as..., Greek often uses:

• δεν ... τόσο ... όσο ...

Yes. Ανήσυχος is the masculine singular form of the adjective.

Because the speaker says είμαι = I am, the adjective must agree with the speaker’s gender.

Forms:

• masculine: ανήσυχος
• feminine: ανήσυχη
• neuter: ανήσυχο

So:

• male speaker: δεν είμαι πια τόσο ανήσυχος
• female speaker: δεν είμαι πια τόσο ανήσυχη

This is very common in Greek: predicate adjectives agree with the person or thing they describe.

Because this is not a more than / less than comparison. It is an as ... as comparison.

English:

• as worried as yesterday

Greek:

• τόσο ανήσυχος όσο χτες

If Greek wanted to say more worried than yesterday, it would use a different structure, such as:

• πιο ανήσυχος από χτες

So:

• τόσο ... όσο ... = as ... as ...
• πιο ... από ... = more ... than ...

Both χτες and χθες mean yesterday.

• χτες is very common in everyday speech
• χθες is a bit more formal or conservative in spelling

You will see both, and both are correct. In modern spoken Greek, χτες is extremely natural.

Yes, Greek word order is more flexible than English word order, although some versions sound more natural than others.

The original:

• δεν είμαι πια τόσο ανήσυχος όσο χτες

A possible variation:

• δεν είμαι τόσο ανήσυχος πια όσο χτες

Both are understandable, but the original placement of πια feels very natural because it clearly scopes over the whole state: I’m no longer that worried.

Greek often moves words around for rhythm, emphasis, or style, but not every possible order sounds equally good.

It can mean both, depending on context.

In this sentence, because it describes a draft, τέλειο most naturally means perfect in the sense of flawless / fully finished / exactly right.

But in everyday Greek, τέλειο! can also mean:

• great!
• awesome!
• excellent!

So the word has both a literal and a more casual enthusiastic use, just like English perfect sometimes does.

Αλλά means but, and it marks a contrast:

• negative point: the draft isn’t perfect yet
• positive counterpoint: at least I’m not as worried as yesterday

Without αλλά, the sentence would lose that clear contrast. The speaker is basically saying:

• Things are not ideal, but there has still been emotional progress.

That contrast is exactly what αλλά signals.