Can I switch back to Plus and will my info sync - had Plus until Oct 2019

Do you wish to switch back from QBSE/QB Desktop, or upgrade from QBO SS/Essentials?

Good afternoon, @pms79.

Thanks for reaching out. I hope you're enjoying the day. 

Great news, yes you can upgrade to QuickBooks Online Plus. The steps to this are simple and your data will migrate over. Please note: If you used Plus before and downgraded your plan, you lost some features, by moving back up to Plus you will gain those features back. However, the data that was removed when you downgraded will not restore once you step back up but will be available to add back in manually if you wish. 

Let's get you upgraded:

1. Go to the Settings menu and choose Account and Settings. 
2. Click the Billing and Subscription tab. 
3. Select Upgrade in the QuickBooks Online section. 
4. Choose Plus and hit Upgrade. 
5. Confirm your payment information and hit Save. 

Check out Upgrade your QuickBooks Online subscription for more details. 

Please let me know if I can be of more assistance. You can always reach back out to the Community or me if you have questions or concerns. Take care and have a good one!