Apple

My phone is a 13 with 512 GB. It is very full, 511.8 GB. I have 1.55 TB of photos on iCloud but another 2-3 hundred GB of photos on my phone. It says there's not enough storage to sync iCloud photos. Of course, there's not enough storage to download all of the photos on my iCloud. I need to upload, not download. I turned off iCloud photos syncing so they'd go through backup. However, iCloud backup isn't working saying there's not enough storage. I have 6 TB iCloud space so that's not the issue. It's like the phone is too full to do anything. How do I fix this without deleting stuff?