Go girl you are a wonder of human nature. You did great dont take any shit from anyone.
Came from a pretty shaky background myself to success in tech but as a self employed consultant which has incredible freedom but on the surface less job security perhaps, but over the last twenty years the phone has never stopped ringing.
An option for you too with your skills.
Comodo is a renewal and updating an artifact (i.e. the actual cert), then you're done, vs. having to handle LE's API to deal with doing it 'automatically' and then carrying that forward. My point is simply that the cost is not zero.
You can still just replace the cert manually like you would any other CA. It's just there's no official GUI to do it with LE and you have to do it more often.
Spamgourmet is amazing and has been really responsive when it comes to fixing the sorts of issues that come up when running an email service (e.g. blacklisted IPs, messages getting shunted to spam, etc). I've been using it since 2007 and it's kept more than 10,000 junk emails out of my inbox. I think it actually started almost 20 years ago.
Unfortunately the operator of the site is really sick and has talked about shutting the site down. Last I heard he'd found someone who seemed trustworthy to run the site when he isn't able to, so we'll see.