Hi, good day!
If you want to keep Pro, you'll need to activate it with a genuine Windows 11 Pro license, which you can purchase from the Microsoft Store (via Settings > System > Activation > Go to Store) or an authorized Microsoft retailer. If you'd rather return to the original Home edition, a clean installation is typically required. Since your PC came with Windows 11 Home, it should automatically reactivate using the embedded OEM license after reinstalling.
I look forward to your update and am willing to collaborate with you until we resolve the issue. Keep me posted by clicking "Add comments" below.