My left side AirPod is not working

my left airpod doesn't work at all, the green light doesn't flash when I put it in the case and it doesn't play any audio. during the left/right headphones test on YouTube the right plays both of the sounds and my left doesn't play anything. it's like my left one is completely dead and deceased to be honest.

I've tried everything, restarting doesn't work (it won't even flash amber and white because my airpod isn't being detected). charging either. the most interesting thing is that I had the same exact problem 7 months ago and when I checked on them randomly (probably 5 or 4 months ago) the left one was completely fine and working. I don't know what to do with it and how to fix it, any ideas?

[Re-Titled by Moderator]