Hello!
Here are some tips for learning more vocabulary words. You can have a notebook in which you write new words that you learn. That way, it'll give you a little personalized dictionary of the new words you've learned. You can also put the definitions so you don't forget them.
Reading is also a good way to learn new words. The more you read, the more you'll see words you've never seen before. If you don't understand a word, you can look it up in a dictionary or ask an adult what it means.
I hope I was able to help you. If you have any other questions, don't hesitate to write to us again! :D