I mostly gave up after years of trying different techniques. For most things I use a public address that goes to a G Suite account. For financial/banking stuff

I mostly gave up after years of trying different techniques. For most things I use a public address that goes to a G Suite account. For financial/banking stuff I use aliases that cannot be logged into (eg banking@example.com where the underlying mailbox is actually something like bankingaaba2e490369@example.com). I've just started using the iCloud hide my mail but you need to remember to capture the generated email address if you're using other non–Apple ecosystem systems.