Yeah this is what I did over a couple of years. Move things over slowly as much as you be bothered… do the accounts and people you use the most first. Eventually you’ll only have junk going to your Google address and you’ll be happy to see it go.
Some (most?) email providers will have tools to help you move from Gmail and keep contacts etc.
I actually think switch email wasn’t too bad (just take it slow!). It’s Google Drive I actually don’t have a good replacement for.
That and Google Photos.
Suggestions welcome.