When viewing or listening to something in English, look up new words in the dictionary or make a note of any unfamiliar words you come across.
There is something for everyone, so why not start watching a new TV show on Netflix or another streaming service?
Read a blog, a book, a magazine, or an online newspaper. Consider how various grammatical forms are applied in various writing styles.
Are you a fan of podcasts? Are you a radio person? If you're not used to hearing American accents, start listening for the test.
To work on your intonation, record yourself saying a series of sentences.
Test your pronunciation of the new words you are seeing by watching YouTube videos that show how they should be said.
Select a subject that interests you, record yourself on your phone or computer, and then play the recording again. Try it a few times and see how you do.