I do the organizing with categories/tags in game libraries that supports it; want to play, playing, beaten, given up, unbeatable.

I also have something similar in Playnite, though I don’t love that program.

I also love notebooks, I keep a notebook around for writing in during games, and I set up lists for each year with a column for bought games and one for played games. With this I can see what games I have played since 2016/17 or thereabout.

I love statistics, and seeing when and for how long I played a game is fun.