@kytta I like using two domains and subdomains. For personal/professional communication:
first@firstlast.com

For most accounts:
something@email.word3mail.com

For bank, etc:
something@secure.word3mail.com

Replace word3 with a generic word and random digit. Consider using an email provider like mailbox.org that allows you to receive mail at any name on your domain so you can have topicX@yourdomain.com