Left AirPod has no audio eventhough case is fully charged

I bought an AirPods2 on 9/9/2021. It worked fine before but lately I noticed that the left AirPod whenever I connect it with my iPhone it doesn’t show the battery status in there eventhough the case was fully charged and has no audio at all. When opening the lid, it doesn’t show the pop up automatically. I tried resetting by pressing on the small button at the back of the AirPods but it doesn’t seem to light in amber just blinking white. I did troubleshoot it already, watched multiple videos on YT but still no luck. I need some help before I will go and have it repair coz it’s a little bit far from my home.