Apache2 client denied by server configuration

[Rip]

Hi @Davidoffo and welcome to the forum.
If it helps any, I can reach your site on both port(s) 80 and 443.
HTTPS is serving a LE Certificate valid until Thu, 02 Mar 2023 10:41:05 GMT

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So at least you know others can access your site at this time. (I am in Oregon USA)
As for the

 AH01797: client denied by server configuration

It looks like that is a permissions issue that needs to be resolved for sure. I am certain another volunteer here would help you with your Apache configuration even though it is a bit out of scope for this forum.
Personally I suspect this directive may have something to do with the issue.

@Davidoffo

 <Directory /var/lib/letsencrypt/http_challenges>
    	Require all granted
    </Directory>

Take a read here:

Wrong rights for /var/lib/letsencrypt/http_challenges (0700 instead of 0755)

I…

ALSO if you share the output of the following commands it will help.

apache2ctl -S
apache2ctl -t -D DUMP_VHOSTS