How come whenever I’m trying to delete photos off my phone, they erase and then they come back?

I’m having trouble understanding how my phone is acting so stupid right now. I have 20K photos on a 65GB iPhone 8. I’m trying to delete as many photos and videos off of it so I can clear some storage on my phone, but whenever I select photos, it erases but then it shows up in my photos again? What might be wrong? I am completely out of storage and most of my storage consists of photos and videos. I’ve tried seeing if I could save them to my iCloud Drive but it says 1% completed. It’s been like that for a really long time. Anyone know how I can fix this ongoing issue? Also, how do I force quit iCloud sharing on my phone? Please help me.

If there are any instructions on how to do both of these things, any link would be helpful. Thank you so much.