I personally swapped over to Proton Mail recently. Exporting over all saved email, groups and labels from Gmail was easy. I love it so far, it's very similar to how Gmail works. I've set Gmail to forward everything to my new one so I don't need to go to back very often.

The only bugbear I have currently is while multi-selecting emails in the inbox, then open one up to read it and back out, the selections aren't remembered. But they are pushing improvements all the time, so I'm sure that will be fixed with time.