>>benhur+(OP)
This makes me anxious about my long time Gmail address. Back then I got it just because it and Google was cool, and their services had a good reputation. It was a different Google back then. If they had launched it this year I would never have got one because chances are it would have been cancelled by 2025. Gmail is really the only valuable thing that actually ties my life to Google. And it's not that hard to replace, but just a bother to inform some people and update account details.
Some email providers have IMAP import, where you just give them the password and they'll do it for you. Not the best solution in terms of security but might be ok if you're getting rid of your account anyway.