I second Duolingo and Drops for mostly vocabulary learning, and then I’d supplement with a textbook for grammar and a more structured learning experience. I keep seeing the everything learning german book recommended, but really, just choose whatever looks reasonable and go through it doing all the exercises

Since the problem of the joycons breaking down has come up a few times, I just want to mention that you can easily couple 8bit-do controllers, or presumably any others, and play with those instead. That’s likely to mean they’ll be available for a while. Not sure that you can do anything about a DS’s buttons breaking