Hi there. I'm Mario, based in Argentina. I work as a system admin since 20 years and work mostly on linux systems and all infrastructure related stuff, like databases, web servers, IP connectivity, virtualization, storage, etc. From the description I can see that the domains/subdomains are already configured, but SSL configuration is not correct. Is that so? In that case, I could help you set things up. I've been setting up certbot in many customers already and for sure can be done at your installation.
Please contact me for further details, I'm available for chat.