hey!
You could always try to use a dictionary and find 'bigger' or more complicated words that have the same meaning. The only way to learn new words and how to use them is to study. You can read or even find a book that has the voice so you can listen but still look at the words to know how they are spelt. I know studying sucks but that's really the only way to learn the words and broaden up your vocabulary.
I hope this helped you in some way.
Have a good day/night !