I mostly play solo right now, usually digital ported one. I occasionally enjoy Small World 2, Imperial Settlers Roll & Write, and Star Realms.
But my favorite for all time is social deduction of Blood on the Clocktower. It fixes Werewolf/Mafia problem by having Storyteller controlling the game + all roles have powers or altering the game significantly + roles in game limited to several possible ones thanks to script. And it also has layers from official script; the most beginner friendly script Trouble Brewing has so much depth, I think I still learning new things after 1 year of playing. Try it out for social deduction, online playable. This is as great as discovering Two Rooms and A Boom.