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I got you covered in combining your QuickBooks Online (QBO) companies into a single user name. You can do this by inviting your other account as a company admin.
First, decide which of your accounts you want to use. Then, follow the steps below:
Repeat the steps I provided above for all your other accounts.
If you need to transfer the Master admin rights, you can follow the steps listed in this article: Change your QuickBooks Online master admin user. Scroll down the page and click the Choose an existing user link to see the steps.
Have other questions in mind? Feel free to comment below, and I'll be sure to get back to you.