I asked an admin but I do not think it will be possible as it becomes an internal pointer for ACME on the servers themselves.
I would use the DNS method if possible.
You will need to attempt renewal manually through Account Manager > SSL Certificates > Get automatic certificate from ACME Provider.
If you get a rate limit error, you will either need to patiently wait for limit to reset or use alternative sites like sslforfree to generate one and manually...
Using PHP mail() is unauthenticated.
You are best to use a library like PHPMailer which has support for authentication to log into the mailbox to send mail as that mail address.
3 other things are either missing or not properly configured.
1. Enable DKIM
Email Accounts > Enable DKIM
2. SPF...
This is a limit imposed by the ACME Provider. All that can be done is switching ACME Provider between Lets Encrypt or ZeroSSL, waiting for the rate limit to reset, or using sites like sslforfree to generate a certificate and install it manually.
Error message when you try to issue a new ssl certificate yourself?
If you are getting a message about weekly rate limit, it is not solvable aside from waiting or going to site like sslforfree, generating one and then manually install it.
Your whole website shows error 500 currently across the board, even I get error 500 visiting your site. That needs to be fixed above all else.
the search console error is not hosting issue
the websites you claim to have are multiple accounts which is a violation of terms of service, one...
500 means an issue with the php script you have.
Your whole website shows error 500 currently.
Google always has an issue on sitemap, that's a Google Search Console issue.