I think the very first step to building resiliency is to sign up for Proton’s cloud services. That will give you access to mail, both from Gmail via forwarding and a new inbox with a separate address. You’d also get a password manager and cloud storage. From there you can start self-hosting alternatives. Probably start with Immich as Google Photos is a big deal and it takes a ton of storage. Proton is a Swiss non-profit so the probability for enshitification is not nearly as high as with Google.