Should I play CSGO,Paladins or Dota 2?

Hey guys!

I am looking for a good game to play in my free time. I used to play a lot of league of legends 1yo ago but because of my school i stopped playing it and when i played it again that will to play stopped.

All of the games i listed are fun,i've tried them and I liked them but as me being me,a stubborn fucker i prefer to stick to 1 game and get good at it instead of wandering around every other game and being average xD

My pc is low spec i would say. I have a rig with amd 2.6ghz, a gtx 520 and 8gb ddr3 1333mhz ram.

So yeah,what game would you recommend me? I am looking for fun game most of all