There are some random DS and 3DS games I have now that I think are pretty rare due to being third party, but I feel like it would be pretty hard to explain to my parents that I’d want to sell a game.
When I was jobless and lacked money I did trade in at least a couple (OOT3D and NSMBU) so I could get some money. I don't like doing it, but it wasn't too hard with those two games as I thought OOT3D was a ripoff and NSMBU I got bundled with my Wii U back in the day and I found the NSMB games to be boring.
Years ago I did sell some ds games that I didn’t want anymore, but haven’t since then. I don’t think that I’m ready to sell again. Especially since selling stuff on Offerup is a bit of a chore.