Go to Settings > System > Activation. Click on Change product key.
Type this generic product key VK7JG-NPHTM-C97JM-9MPGT-3V66T to upgrade to Pro edition.
Once upgraded, you can activate the system using your Pro edition unique key.
Refer detailed steps here:
https://www.kapilarya.com/how-to-upgrade-windows-11-home-to-pro
Let us know if this helps!
Note: Included link in this reply refers to blog post by a trusted Microsoft MVP.