Product: Claude Clock / Modern Clock
URL: Claude Clock / Modern Clock - KDE Store
Current category: Plasma Mobile Widgets (placeholder, wasn’t available in the upload dropdown)
Desired category: Plasma 6 Applets
I recently got my product also moved to plasma 6 applets. On the edit page of your product, try choosing “Linux/Unix Desktops” then there will be a sub category so basically try choosing this:
Linux/Unix Desktops → Desktop Extensions → KDE Plasma Extensions → Plasma 6 Extensions → Plasma 6 Applets.
For some reason on my end i couldn’t find it but maybe you can choose it yourself. If yes i hope this reply helped 
But maybe the category “Plasma 6 Clocks” would suit your product more which is also under these sub categories where Plasma 6 Applets is located.