Hi there, overwilhelmed.
Thanks for taking the time to do the initial troubleshooting steps to fix the client list.
The clients are likely filtered, which is why you're only seeing those with active QuickBooks account. We'll want to check the Gear icon on the left-hand side and click on the mini gear icon located at the top of the Client window. Make sure to tick the boxes for the client's status you want to show.
If you're still experiencing issues, we'll want to contact QuickBooks Online Support for assistance. They can check on the system and see what's preventing you from seeing your clients.
You can also learn more about what to do if you don't see a client's company on your client list from here: Find missing client companies in QuickBooks Online Accountant.
In the future, you can refer to this article on how to manage clients in QuickBooks Online Accountant.
Let me know in the comment section below if you have any other follow-up questions while handling your clients' files in QBOA. I'm always here to help. Have a good one!