Privacy/encryption is a top priority

Large Gmail archive needs migrating over. If possible, I'd need to receive emails sent to my Gmail account (even if I can't answer them from that Google email adress).

I recently switched from Gmail to Proton but I'm already looking to switch again.

I just want a mailbox that's safe and nice. Much like Ente really. I tried Tuta because they are "friends" but I only saw negative feedback...

EDIT: I choose mailbox.org!

My current Samsung phone (S23) is struggling real bad. I need to change it. I've been focused on privacy lately and learnt about GrapheneOS. This is not really the point of my question. Rather the context.

What is the overall feedback of the Google Pixel 10a? I'm seriously considering it, refurbished. It looks compact enough, has space for a physical sim card...

I hope I'm making the right choice!!