How to find my left AirPod?

my left airpod has been missing but i haven’t gone out the house. i checked where i had last put it and it’s not there,anyway i’ve searched my house and ik i’ve probably overlooked somewhere bc its small, i rly don’t wanna have to buy a new one i’m also not sure who this would be resolved without buying a new one.

[Re-Titled by Moderator]