Hi @UZi02
perhaps you have used tls-sni-01 - validation. But this method is deprecated, support ends 2019-02-13:
So Certbot uses the apache - authenticator - and fails.
But I see, you have already tested your domain with my tool - https://check-your-website.server-daten.de/?q=bulgarische-feinkost.de
There is a 404, not a 403.
So webroot should work, webroot as authenticator (-a), apache as installer (-i).
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But: You have 30 domain names. So you must define a lot of -w - parameters if you want one certificate with 30 domain names.
certbot run -a webroot -i apache -w /var/www/example -d www.example.com -d example.com -w /var/www/other -d other.example.net -d another.other.example.net
Or you split your certificate, so you have one certificate with www.bulgarische-feinkost.de + bulgarische-feinkost.de, the next certificate with the next main domain etc.