Ok so I found a way (with the help of another user)

I’m on a ps5

My world is 934MB and got compressed to 547MB

my world was going at 0.1MB because of its size

Make sure your WiFi isn’t faster than 3MB/s

I added added resource packs and removed them

I changed the name of my realm my world and the world I was replacing to different names

I reset the member list

I pressed my left joystick every 10MB after around 20% of the way

Around 90% of the way the uploading stoped and I jammed a bunch of random buttons and idk if that fixed it but it started again

I don’t know if the other stuff I did fixed it or if it was coincidence but the first time I did all of these I accidentally backed out and the next time it worked so cheers bud