Learn Finnish: Me mennään ulos, koska me itsenäistytään yhä enemmän. - We're going out, because we're becoming more and more independent.

Unlike English, which repeats the comparative (more and more, bigger and bigger), Finnish uses the adverb yhä followed by a single comparative word. yhä indicates a continuous, ongoing change, so yhä enemmän perfectly captures the idea of becoming 'continually more' independent.

Why are the verbs mennään and itsenäistytään in the passive form when the subject is clearly me?

In spoken colloquial Finnish, the passive form is almost always used for the first person plural (we) instead of the standard written forms like menemme and itsenäistymme. When using the passive this way, you must always include the pronoun me so people know you mean 'we' rather than a general passive action.

How does the word itsenäistytään break down?

The base verb is itsenäistyä (to become independent). It is built from the adjective itsenäinen (independent). The suffix -tyä or -tua is a very common way in Finnish to turn an adjective into a verb that means 'to become [adjective]', which perfectly matches the idea of an ongoing change happening in this sentence.

Could I use aina vaan instead of yhä to mean the same thing?