More reading would be very supportive to expand your knowledge of vocabulary. Make a hobby to read a novel of your interest. It will significantly increase your vocabulary.
Try to learn words in context. Connect the meaning of words with something you can easily remember with.
Interact with people in different segments. In this way, you learn from others. You may experience something different.
Frequently utilize those words you have learned. Thereby, you won’t forget those new words.
Make learning enjoyable through playing games like scrabble and other educational apps.