Requirements:
- free
- will not delete my account due to inactivity
- privacy focused (doesn’t have to be crazy private, just decent)
- doesn’t require my phone number
- doesn’t require an invitation (like riseup mail)
Additionally it would be cool if it allowed me to have few email addresses in 1 account (skiff lets you have 4 addresses you can send emails from, but they are shutting down their service).
IDK about each specific requirement (especially the “inactivity” one, but … dude, just log in every 6 months), but I’d say a lot of “privacy” email providers should meet your needs.
Try looking into Proton mail (warning: you’ll have to setup a local relay if you need IMAP/SMTP) or maybe search the web for something like “privacy email provider free” and look into the results.