In all seriousness it does kinda feel like the 3DS stopped putting out a ton of must-have titles around 2015. But I think the company was going through a few weird years there transitioning into the Switch era. Not that the games released since then have been bad, but I remember 2013-2014 being the system's peak.
Really enjoyed the system itself though, especially the XL model. Although I can't exactly recall a laundry list of my favorite games on it, I know I've put hundreds of hours into it and feel like the system successfully pushed past the awkward middle phase of the DS (where the tech wasn't quite there for great 3D games but did allow for A+ 2D games).