If you can still use a mouse well, grand strategy games can be a lot of fun. 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 a lot of fun (think civ but fantasy) and since it is turn based it is a lot easier to play with just a mouse.