All of my email are going to spam

I've spent about 6h on calls to tech support being bounced between home support and then transferred advanced support (who refuse to help and then force me to make another ticket) lets on hold for hours. 

I have a custom domain set up with my home account (which seems to no longer be a product)

Every email I send to clients ends up in the spam folder. Tearing my hair out, its been going on for about 8 month now