I've spent a bit of time trying to move away from Google. Here are some tips you may wish to consider.
- Set up your gmail account to auto forward your emails to another service provider such as ProtonMail or Tutanota. Start changing all your accounts to use your new address. You might find you have subscriptions and accounts in places that you never thought of. Consider keeping the autoforwards going for a year or more before completely deleting your gmail account.
- If you want to give out fake e-mail addresses, consider simplelogin.io. It is a great way to mask your real e-mail address. Alternatively, there's guerrillamail and getnada for throwaway one time use.
- Check out this enormous repository for Google alternatives.