hi @webhosting
It's not all doom and gloom.
A) Use the manual with cloudflare is very easy
certbot certonly --manual -d forumweb.hosting -preferred-challenges="dns"
I see you are using cloudflare so it should be straightforward to add the required dns records
Future versions of certbot have the cloudflare record updating automated use the Python Lexicon library
B) You can turn the proxying off while you issue the certificate this will give you the ability to use the TLS-SNI and HTTP-01 challenge and after that you can turn the proxying back on.
Andrei