Really depends on that you are looking for.
This is gonna be a long comment. Beware.
For fps. I'd say csgo. But it's going to die soon. So I'd suggest pubg or R6S.
For Tactical Fps. Escape from tarkov is amazing. Maybe Arma if you want something that will challenge you heaps.
Racing games. The Forza horizon series got me hooked. Project cars 2 is also quite nice.
Destiny is okay, you just need time and passion to play it.
For more adventure based. It's always great going back to play Skyrim. Far cry(any of the games)
Overwatch is nice, there is just a very large skill gap..
Rust is good, just be prepared for salt and dying alot.
Warframe is a good game or so ive heard, apparently really fun at the moment.
Tekken 7 or street fighter are both really intense and fast paced. Easy to get hooked if you like that sort.