Hello there @Seller_Ap7JQ8m5J53A8

My name is CR and wanted to provide you with some information for your question.

To switch from an Individual selling plan to a Professional selling plan:

1. From your seller account, click Settings, and then select Account Info.
2. On the left side, under Seller Account Information, go to the Your Services section and click Manage.
3. In the Sell on Amazon row, under the You are signed up for section, click Upgrade.
4. Review the terms on the next page, and then click Proceed to Upgrade. You will be returned to Your Services. A message will appear indicating that the upgrade process has started.

I have included some help pages below that provide additional detail regarding individual and professional selling plans:

Selling plan comparison

Switch to a Professional selling plan

CR_Amazon