Here is a list of steps to merge multiple email accounts:

1. First, choose an email platform that supports multiple accounts.
2. Create a new account on the chosen email platform and add the email accounts you wish to merge.
3. Activate the new account’s settings for auto-forwarding emails from the other accounts.
4. Set up the reply-to feature so that when responding to emails, the reply will be sent from the new account.
5. Set up the auto-responders for all the forwarder emails.
6. Review the settings to ensure that all email accounts are merged in the new main account.