My advice to you is to take one step at a time, explore at your own pace. It’s easy to get overwhelmed, but IMO each step is beneficial on its own. E.g. instead of moving to Proton.me in one night (or any other email provider), first start by forwarding the emails and see if you’re ok with the product
https://m.youtube.com/playlist?list=PLR_ghQEN2SgB5ZpiIIzlJvtXhXHfEf1M7
TheHatedOne on YT has some good resources
You can also find degoogle lists with alternatives for each app, e.g. here: https://git.tycrek.com/archive/degoogle
My advice to you is to take one step at a time, explore at your own pace. It’s easy to get overwhelmed, but IMO each step is beneficial on its own. E.g. instead of moving to Proton.me in one night (or any other email provider), first start by forwarding the emails and see if you’re ok with the product