Forza is always good, the normal ones or Horizon if you like the free roam better. Rare Replay is for sure worth the $30. I'd recommend subbing to a year of EA Access as well, most of the games are multiplat but you do get Titanfall in it at least which is good. State of Decay was pretty fun if you haven't played it yet. I still say it's at least worth running through Ryses story and Dead Rising, but those are all on PC so you may have played them. A lot of the f2p games are decent like Neverwinter and World of Tanks as well. And yeah, Sunset Overdrive is worth playing. Oh, also Max is worth grabbing, can find cheap codes for it since it was both a free game with gold and handed out in a contest a while ago. Crimson Dragon was alright as well if you kind of want a quasi Panzer Dragoon game.
Trying to stick to the exclusives, but outside of that there's a bunch of good games that aren't exclusive, so you may have played a lot of them already.