What do you do with a broken game?

Half a request for help, half discussion. I have a Zelda 1 cartridge that I've had since I was 13 years old. It's in great condition, looks awesome, but every time I have ever attempted to boot it up it just endlessly resets itself. No idea why! Final straw was when I took it to a game repair guy and he admitted he had no idea what was wrong with it.

I bought a replacement, but it feels like such a shame to just outright trash the old one... And no game store is gonna take a busted game. What would y'all do in this situation?