How can I make my left AirPod charge when my AirPod case is fully charge

If the left AirPod is not charging when you put in in the case and optimized charging is not on, please reset your AirPods to see if the issues persist

• AirPods (all generations) or AirPods Pro (all generations): Put the AirPods in their case, close the lid, then wait 30 seconds. Open the lid, then press and hold the setup button on the back of the case for about 15 seconds, until the status light flashes amber, then white.

Reset the AirPods and then re-pair, I would also try to clean them and the case to be sure the case is making contact with the case.