Having deployed many certs, I would suggest deleting all certs and re-load
the certbot.
Also, too many redirect can also happen because of improper HTACCESS
redirections (e.g. www to non-www then force https, then www...)
If it catches a loop or illogicalities, it generated the error you're
facing.
So if the certificate is installed and all, triple check your HTACCESS
redirects and every other linked platform that can create redirects
(cloudflare/wordpress/cpanel/whm....)