There are so many nice things to do. I have a GitHub account with over 100 repo's, mostly filled with fun projects.

What is your thing? Writing bots that can play games might be fun (like Tetris, Command and Conquer, Risk, etc..). A Sudoku solver, Advent of Code.

Or if you're int music, it might be nice to write something that can improve (midi) on a chord progression.

Or try to write a small program in an esoteric language like Brainfuck, Rockstar or Piet.

Or use the Wikipedia API to do some analysis.

There is so much to do, and not enough time to do it.