ios – most a part of iPhone 13 picture’s gone after erasing content material & information whereas enabling iCloud Picture

I am lacking 4 years of images after erasing content material and information of iPhone 13 whereas iCloud Picture was enabled.
I enabled iCloud Picture simply earlier than erasing.

1. Is there an opportunity that almost all of my images have not been uploaded to iCloud earlier than erasing? Though, earlier than erasing, all? the information is being uploaded.

2. I am hoping that my images are in an older, however latest iCloud backup (from earlier than I’ve enabled iCloud Picture), however the one backup I can discover dates again to 2020. How come? iCloud again up was enabled.

Thanks to your assist and insights.