01. Do a review of the vocabulary and the grammar rules.

Sometimes, we feel a little limited, I mean when you want to express and you don't have the right words. So, you have to do a little review and try to learn all the grammar rules and practice every single day.
Here are some online pages to learn the vocabulary or practice the grammar rules:
-http://learnenglishteens.britishcouncil.org/grammar-vocabulary/vocabulary-exercises
-https://www.vocabtest.com/vocabulary_workshop/level_b.php