Try to use a more precise word eg. rather than saying. The boy walked to the shops. Think about how he's walking to the shops.
Try to pick the word that best fits the image that you want to put across. Which words sound best?
The boy lumbered to the shops.
The boy marched to the shops.
The boy trotted to the shops.
All of these sentences are more interesting because they sound more precise.
Useful Websites to boost vocabulary
The following website is also really helpful for developing vocabulary https://membean.com/ It's really visual effective way of developing vocabulary. It has fun videos to help you remember the words and loads of examples of the words in action.
Think about using https://www.thesaurus.com/browse/best when doing your writing to help you use better words in your writing.
https://www.vocabulary.com/account/schools
Apps that boost vocabulary
These are all free to download apps which have been recommended as ways to improve vocabulary
https://apps.apple.com/app/wordup-smarter-vocabulary/id1365078730
https://play.google.com/store/apps/details?id=com.magoosh.gre.quiz.vocabulary&hl=en_US&gl=US
https://apps.apple.com/us/app/words-with-friends-classic/id321916506
https://www.amazon.com/Applimobile-com-PowerVocab/dp/B005EZKS26
https://play.google.com/store/apps/details?id=com.kooapps.wordxbeachandroid&hl=en_GB&gl=US