My iPhone storage was full but I deleted lot of photos and videos but it still don’t have space and not backing up.I'm trying since yesterday plz help me what should I do now???

Also know that when you delete photos and videos, they don't immediately delete. They go to the Recently Deleted folder, where they hang out for 30 days to give the opportunity to restore them if you want.

Go there and permanently delete and some space will be cleared. Whether that will be enough space I don't know. You may need to delete other things, such as Apps, Music, Messages, Email, Files, etc. to get more space.

Delete more.

The only way to free up space.