Welcome to Apple Support Communities!
I understand that your right AirPod seems to be quieter than your left. I have a few steps that you can try today. Please verify that the volume is centered between the left and right ear by navigating on your paired device to Settings > General > Accessibility and then scrolling down to the bottom of the screen under "Hearing" to check that the volume balance is centered between the left and right channels.
Additionally, it may be helpful to clean your AirPods. You can find instructions for doing so here:
Clean your AirPods with charging case
Clean your AirPods with charging case regularly with a soft, lint-free cloth. Don’t get moisture in any openings, and don't use aerosol sprays, solvents, or abrasives.