I have 1000 games combined in Steam + GOG + Battle.net + EA + Prime + Epic, and I have lots of consoles such as Switch, DS, Wii, Playstation 2, Super NES...
And I only play Half-Life all day. Yeeeeeeee!
Really, Half-Life is all you need. Shit has more than 1000 mods. And multiplayer is still alive. Man... you NEED to play HL1 multiplayer. 32 players, crossfire, absolute chaos. And once you get the Gauss Gun you are a demigod. The gun can make you fly, kill multiple enemies, kill people behind walls, at corners, you can even angle the shot on a lamp. Movement is amazing. I have 900 hours and can't get enough.
My favorite mods are Afraid of Monsters, Sven Coop, Counter-Life, The Specialists, HL Echoes, Delta Particles, and Poke646. Waaay too fun.
Also I like FPS games like Doom and Halo, Strategy games like EU4 and AOE II, and Nintendo games, especially Smash Bros.