Aesthetic

Write! You need to learn how to apply the grammar rules in longer texts. Write about a page or so. You can write longer profiles, translate songs, poems, paragraphs in books and much more.

Read! Go to your local library, a pdf on a book, or anything  and see if you find some books with easy short texts like children's books or poems and practice reading them out loud, understanding and translate them.

Watch movies or series in that language. This will be good in understanding people talking that language, also it can help on pronunciation and maybe you find some vocabulary you want to write down.

Listen to music in that language. As with movies and series, this can help your auditory understanding, give you some pronunciation and give you ideas to more vocabulary. And this is also possible to do on the go.

Use apps! I have heard the app Duolingo is good and I used Memrise and it was ok but didn’t work for me. To find apps can be hard, the apps suit people differently. What works for me might not work for you.