iphone 7 plus full memory not turning on

I can't turn on my iPhone 7 plus due to lack of memory. I can't update it either. The only way to get it to work is to restore it, but I have too many invaluable family photos on there of my last overseas trip that were not backed up yet. I will do anything to get access to these files. I reported this in January 2020. I was told Apple was working on a fix for this issue as other iPhone users were facing the same problem. It's unacceptable that a device can't start up due to lack of memory. There should have been a safe buffer build in the OS to prevent this from happening. I wasn't able to delete files or apps. I was told by an Apple employee that the reason for this is that deleting files actually requires memory to execute this task. Can someone please assist and update us if there's a fix for this problem. Your support would be very much appreciated. I haven't been able to use my iPhone 7 Plus for almost a year now.