I'm happy to see you here in the QuickBooks Community. I'll share different steps on you can move from QuickBooks Simple Start to other subscriptions or to QuickBooks Online software itself.
If you're referring to move your subscription from a Simple start to Plus or Advanced, this comes with easy steps. I'd be glad to show you how to get this done. You have the option to upgrade your subscription from the Billing and Subscription page.
Click on the Gear icon and select Account and Settings.
Choose the Billing & Subscription tab.
In the QuickBooks Online section, select Upgrade your plan. If you don't see it, you’re already using the plan with the most features.