Hi there,
Welcome to the Community. Mistakes like these are common but don't worry, I'll be happy to show you how to upgrade to the appropriate plan so you can enjoy the amazing features offered in QuickBooks.
In order to achieve your goal, I encourage you to check out this helpful article that shows you how to: Upgrade or downgrade your QuickBooks Online subscription. You're more than welcome to ask questions as you go through the article.
I'll be one message away in case you need anything else. Otherwise, I wish you a great rest of the week.