Nah, not playing through any here. I was considering the Bowser's Inside Story remake, but my 3DS seems to fail to recognise SD cards any more, and at this point, I decided it was probably best just to call it a day with the console. The Switch is just more fun right now.
I still play Pokemon Ultra Sun with multiple rulesets and have a just started SMT spin-off on my hands as well as other games but there are better versions of the ones I got on Switch.
My 3DS stopped being useful right as Smash Ultimate came out.
I sold Smash 3DS and haven't touched my modded 3DS for much since.
Back when Freeshop was still running, I did play through a game called "Sayonara Umihara Kawase" which is an incredibly hard platformer with a really unique gimmick. It's the only reason I ever pick up my 3DS to try and beat the last few levels while waiting in the doctor's office or something.
It's on steam too, it's probably the better version:
ace combat assault horizon legacy is the best 3DS game nobody talks about. Not a downport of the trash HD twins games like the branding impliews but rather a good remake of Ace Combat 2
I still use my 3DS on occasion for some 3DS or even DS games I missed out on over the years. While I don't use it as much nowadays, it's definitely a "keeper" for me and I would not sell it or anything at any point.