You can use Gmail aliases. For example:
ben4watches@gmail.com
ben4watches+work@gmail.com
ben4watches+shopping@gmail.com
See https://support.google.com/mail/answer/22370?hl=en for more.
This is also a good article: https://beebom.com/what-email-alias-...gmail-outlook/
You also have ben4watches@googlemail.com (see here)