I use Fastmail, previously used Proton, Mailbox and Disroot.
I have an email for IRL and one for online as well as some "masked emails" (Fastmail's equivalent of aliasing) for services I don't trust. I'm still transitioning away from Addy for email aliasing.
I currently use Bitwarden although I have been looking into 1Password and KeePass.
Decentralized, Fastmail, Mullvad, Bitwarden and Ente Auth.
Self hosting email is hell from what I've heard and I currently don't have the resources to do that anyways.
IIRC, the price for a Source engine license is $50K, Valve also has been picky about who gets them these days because people kept leaking stuff.