How to renew my Apple Care?

Yes, you can extend it, but not until it expires. The day after it expires you can follow the instructions in the link that NachiThePanda helpfully provided. You actually have 60 days after expiration to extend it.

Right. The day after it expires there will be an option to extend it.

Hello! Please refer to this article on extending your applecare warranty:

https://support.apple.com/en-us/HT210580