Recovering permanently deleted photos from iCloud Photos

Hello, I urgently need help recovering thousands of photos that were accidentally deleted from my iCloud Photos library.

I have two iPhones connected to the same Apple Account with iCloud Photos enabled.

Yesterday, I deleted photos from my old iPhone and also emptied its Recently Deleted folder. My current iPhone still showed all the photos yesterday, but today they disappeared from there as well.

The photos cover approximately five months and are very important to me.

I also have an iCloud backup of my old iPhone dated yesterday, approximately 5.8 GB in size.

Could you please check whether there is any possibility of recovering my permanently deleted iCloud Photos or restoring an earlier version of my photo library?

I have not reset or restored either device.

Thank you for your help.