My headset mic died, what should i replace it with?

if it's a headset with one 3.5mm plug and your pc has separate pink and green jacks, the mic won't work at all without a splitter. caught me out once, i was about to bin a perfectly fine headset.

Before buying anything, make sure it's actually the mic. Plug it into a phone or another PC and check Windows sound settings, because a Windows update switching the default input device kills more "dead" mics than hardware does. If it really is gone, you don't have to replace the headset. A clip-on boom mic that sticks to the earcup works fine if you still like the headphones, or a cheap USB desk mic will sound better than most headset mics anyway. Just put a noise suppression filter on it in Discord if your keyboard is loud.