p5js is an awesome library! If you're looking for ideas to play with, checkout Dan Shiffman's Youtube Channel - Coding Train[0], a series in which he build ML libraries, games and lots of fun mini-projects.
His coding challenges are a source of endless entertainment for me. I swear I could watch an hour a day of his unique combination of cheery, clumsy, and informative.
0: https://www.youtube.com/user/shiffman