▲ ▼ Migrating from old Gmail account

I would like to migrate from my decade old Gmail account to another email service provider. Downloading the emails from Gmail is straightforward.

But changing the email id to current email id across different services we are using is a pain, Especially for those services where we don't use 'Sign in with Google'.

Current strategy to find the services we are using with the Gmail id involves searching for account activation information, There are services which automate this but they are not 100% accurate as some services especially those from Govt. don't send account activation email.