Welcome to the Community. QuickBooks Online is a powerful program that makes it easy for you to keep track of your income and expenses. I'll be happy to share more info so you're on the right track with achieving your goals.
Based on what you've described, it's important to note that there isn't a way to reset the user roles. The good news is you can manage the users directly from the Manage users screen. To get to this screen, click on the Gear icon > Manageusers. From here, you can remove the accountant and add them as a regular user. Here's a helpful article that shows you how to: Add and manage users in QuickBooks Online.
In case you need to learn more about the user roles in QuickBooks, feel free to check out this article here. Let me know if you have questions. I'll be here in case you need anything.
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