How can I find my misplaced AirPod Pro 2?

I recently misplaced the left ear AirPod lucky fully charged. Problem is I keep playing sound but nothing, I even stand over the area all sorts of hours through the day and night to distinguish the sound. As well as for direction keeps saying more light/ keep moving to a better signal. Bad thing now is the battery displays low battery. I feel like I have exerted all scenarios.

[Re-Titled by Moderator]