If you can still use a mouse well, grand strategy games can be played with one hand. Despite all the (deserved) criticism they get, paradox games are a lot of fun. (and their modern ones even feel like a full game without having to buy any dlc) They can be a bit difficult to keep up with without a keyboard though so play on lower speeds.
If you are more concious about who you give your money to, endless legend 2 is a 4x published by hooded horse that is very good (think civ but fantasy) and since it is turn based it is a lot easier to play with just a mouse.
Any points and click adventure game, there are loads including old classics and modern good games.
Monkey Island remasters are fun and can be played with mouse. Broken Sword games are also good.
Rusty Lake games are great if you prefer more puzzle games than narrative ones. Still has a great somewhat surreal plot just not like a point and click narrative game.
Also If you havent played dwarf fortress now is the time to learn, the siege update came out this week. Mouse or keyboard, or both, but definitely can be done one handed.
Vampire Survivor that others have suggested is a good shout, one hand on the keyboard is enough and its very addictive.
If you have a joystick or wheel, flight Sims, space sims, racing games might be possible.
RTS games in single player mode (just play on an easier difficulty). Plenty of decent ones have been released in the last little while. Also, maybe 4x games, total war etc.
Anything turn-based, especially mouse-driven titles. Slay the Spire, Chess, Riichi Mahjong, Balatro, etc.
Puyo Puyo Champions has a one-handed preset in its controller options. Do note that if you want to play online, only Switch is active since that's where Japan is, I can't recommend the game on other platforms.
Kirby Air Ride uses only one button + analog stick, and any button works, so you can use L. Would have to be left hand for the original, but the sequel coming out later this month has a detailed accessibility menu, which I bet will include right-handed settings.
Crypt of the Necrodancer is designed to be playable with just four arrows, in case anyone wanted to play it on a DDR mat. Which also means you can play with arrow keys or WASD.
Rhythm Doctor is actually just one button.
Rhythm Heaven Fever uses only A and B. Rhythm Heaven DS uses only stylus. The rest of the series uses d-pad as well though, so those are less playable.
Come to think of it, any DS game that only uses stylus.
I enjoyed Cadence of Hyrule a lot more than Crypt of the Necrodancer for some reason. Maybe I just love the setting of Hyrule that much more. Probably just the overall polish on the game. But that’s an easy recommendation.
CoH's control scheme requires both hands, so I can't recommend it to OP. But I'll also have to say that I have the opposite opinion, CoH was good for a casual playthrough but wasn't something I could sink several hundred hours into like the original. The overworld made runs much longer and much more repetitive since a lot of it is always the same.
Sins of a Solar Empire. It’s a space based strategy game that I’ve sunk hours into. years ago I used to have really shotty internet so it would go down all the time. I’d play that game for 8 hours a pop easily and the time would just fly by. I’m not even a big strategy gamer but I adored that game.
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