I appreciate you for taking the initiative to try the necessary troubleshooting steps before reaching out to us here in the Community. 

The troubleshooting steps you've mentioned are typically effective for issues like app launching. I'd recommend contacting our Technical Support Team, as they have the necessary tools to pull up your account and provide additional troubleshooting guidance.

In the meantime, you can temporarily access your account through a mobile browser by visiting: https://qbo.intuit.com/. From there, you can continue doing your business tasks such as creating transactions and reviewing your reports.

Please let us know if there are any additional questions we can assist you with.