If you have subscribed to a plan (not a free plan) and want to upgrade it to get more features, please follow the steps below and easily get what you need:

Step 1: Click the profile photo and click the My Account button.

Step 2: On the account page, click the Billing button on the left side, and then click the Upgrade Plan button to choose a suitable plan to subscribe to.

You only need to pay for the difference.