In the QuickBooks Community, you can only change your email or name to your current account to retain your level, Deadwood. I'll explain more details below.
 

The option to merge one account into another in QuickBooks Community is unavailable, you can follow the steps provided by my colleague above on how to update or change your info without affecting your level.
 

Moreover, you can check this article for assistance with QuickBooks or to learn how expert QuickBooks users can offer help: QuickBooks Q&A.
 

Let me know if you have questions about managing your account in QuickBooks Community. I'm here to help.