There are many good reasons to change your Gmail email address without going to the trouble of creating a new account. Maybe ...

To start, just open the app and click your profile icon on the top. It should have a “Add Another Account” button. Tap it and select the email client you’re using. I’m adding an Outlook email, ...

Open your new Gmail account. Click on the Gear icon and select See all settings. Go to the Accounts and Import tab. Click Add another email address in the Send mail as section.