How do I recover lost Photos from iCloud Family Sharing?

IPhone 13Pro with a Vorizon phone number that had to be closed; my Vorizon a/c had been compromised and was being investigated. That trusted phone/number associated with another icloud acct. is no longer accessible by means of that device. The loss of 4 years in my photo library and my contacts, is what I sincerely hope to recover. I have tried In-store Support, Apple Support by phone, and no one is able to help me resolve this issue. Apparently Family Sharing, that I was unaware of being linked to, is the reason there is problem? Is it possible to get access to my lost data?

[Re-Titled by Moderator]