One of the keys to learning any skill (including language)

One of the keys to learning any skill (including language) is mastering it in its 'small but complete' form.

There are endless examples of this, here are a few:

If you can paint a single perfect flower, you can likely paint anything perfectly (not necessarily, but if you can't paint a perfect flower then it's unlikely that you can paint everything else perfectly).

If you can do the basic steps of a dance, you are on your way to dancing well.

If you know a single verb, just in first person, in past, present, and future, in the language you're learning, that's a microcosm of the grammatical system of the language.

The key is recognizing the microcosm - seeing the 'whole picture' in its small (not simple, which implies details are scrubbed) but complete form, mastering those basic steps, and allowing them to bloom.