I have a huge number also. And I've played a small fraction. For example, Stellaris - I've got almost 900 hours played. Against The Storm is running a close second. Some other games, less than an hour. If it is 99 cents, I'm probably going to get it if it looks somewhat similar to anything I enjoy.

If you check out Humble Bundle, you can find bundles of games where you get 20-30 games for around $20. Many of them are charity bundles, like one I got to help people in the Turkey/Syria area affected by the 2023 earthquake. Those bundles mostly consist of keys redeemed on the Steam platform. I don't play first-person-shooters, so those are going to sit in my library unplayed & uninstalled.