Many thanks fulltilt,
I've already done the Snap Certbot earlier so I've just applied the latest LE plugin. Earlier I had to revoke and create to make the certificate works again but this time after rebooting the server, it just works, the browser doesn't give a warning anymore.
Now I can only wait and see if it'll still be good tomorrow morning. (I'm in Thailand and it's 22:22pm right now).
Edit: 14-Feb-2022 09:53am Still working well.