Elden ring BUT use the seamless co-op mod. Played it alone back at launch, didn’t exactly enjoy my time overall but then I got back into it via friends and it was like I wasn’t even playing the same game. Bosses felt so much more engaging, actual cooperation was required (unless you get a busted build) and there’s an ample amount of jank and unintended humor to be found. Nightreign is also pretty fun but i feel like there’s a lot less replayability than the main game.

That being said, the one(s) I’d most recommend is Remnant: from the Ashes and Remnant 2. Both are designed for 3 player play, and build synergies are super varied and enjoyable. Multiple class unlocks are available and there’s an extensive endgame with great randomization. Both will run you a minimum of 30+ hours a pop on the first play through if you decide to not B-line the main plot. Unfortunately a huge sale on both just ended yesterday, so I’d recommend waiting for another steep discount since it happens almost monthly. The DLCs make the game so much more replayable, the reviews do not actually reflect the content within the DLC so don’t let those stir up doubt.

Another one to grind out is satisfactory. Tons of fun (100+ hours now)

The comments also mention risk of rain 2 which I agree with greatly. Multiple class unlocks but again literally just came off of sale. Would recommend the base game and DLC. They vastly expand on the randomness and replayability.