Sounds to me you have a bit of an saturation issue than it being a service issue.
I keep my e-mails fairly organized. ProtonMail is served as, to me, the 'mostly everything' e-mail. GMail is still around because I got stubborn services and people that use it and I need it incase ProtonMail fails somehow. I've got a MIcrosoft account that's strictly for personal/private use like banking and insurance stuff.
That's fairly simple. I've no idea what you're trying to do.