It's glad to hear that you're now up and running, @Anonymous.
I would like to thank you for sharing these steps that you've tried. This would absolutely help other users who encounter the same issue.
I've added here a handy guide that you can check out in using QuickBooks: QuickBooks Desktop for Mac guide.
Please know that the Community got you covered should you have any concerns with QuickBooks. We're always here to lend a helping hand. Wishing you and your business continued success!