There are a few ways to resolve a copyright strike–wait for it to expire, get a retraction, or submit a counter notification. Note that deleting the video won’t resolve the strike and the claimant has 10 business days to respond. More details here: https://yt.be/help/fhTF
Update! The counter notifications submitted were rejected appropriately. This video (vDSPAIXRkqA) was not processed due to the info provided. You can resubmit after completing the details here: https://yt.be/help/dHCP More about counter notification: https://yt.be/help/9Bk1