Congratulations on the purchase! I couldn't possibly imagine getting a console and leaving it unopened for 2 months, but well, we're not the same person for a reason. Sucks that your Joycon was acting up too, thankfully you got it replaced. The Joycons are infamous for their analog drifting issue, but yours was an entirely different situation. Crazy how fragile they can be.
As for game recommendations... get Hollow Knight. It's easily one of the best games on the system (including the AAA 1st party stuff), and it's unbelievably cheap. If you're into Metroidvanias, it's gonna be right up your alley. If you're not into them, it'll probably get you into them. It's that good.