Things I like:

avatar generator: https://getavataaars.com

Puzzle challenges: Rankk challenges

password rules are dumb* instead check your password strength with zxcvbn**, generate longer passwords you can remember with diceware

Challenge yourself in December with advent of code

Challenge your regex skills with regex crosswords

Still bored

_{* any rules beyond the minimum length one}

_{** password checkers can only ever tell you if its a bad password, not if its a good password}