In my limited research on email services I've determined that Tuta.com (formerly TutaNota) and BraxMail.net seem to be the best options so far. Ask for details if you don't already know why these are good.

Which of these is better?
Is there more to know?
Which one should I pick?

In my limited research on email clients I've determined that Betterbird.eu (a fork from formerly great Thunderbird corrupted by the now evil parent Mozilla org). Ask for details if you don't already know why this is good.

Is there more to know?
Any tips on scraping/archiving off my GMail, including all the folders and sub-folders?

Also:
Have you any tips on scraping/archiving huge volumes of RSS feeds?
(A few years ago my Thunderbird scraped a bunch of feeds and sites, including SaidIt.net, until it just got too bloated and full of duplicates and errors. It became unsearchable and thus unusable. Also, fuck magnora7.)