If you never start you'll never be free. It's also not all or nothing. You can keep things with Google, self-host new stuff and gradually move over things that make sense to mover over.
At least use a service with actual customer support like Fastmail, and backup your email with an email client that downloads copies of your email to your computer.
I mean Proton seems like a good (although extremely expensive) option, but these small companies could go out of business on a dime which is a problem when the effort to switch is a titanic undertaking.
