You are out of data storage space and minecraft is unable to save your progress

so I got this error today ….

I try to do like restart my pc , restart the game and it is same ….

last time I played Minecraft is yesterday ….

flying with elytra into new chunks to find some gravel..

and my save data is around 700mb ...

and I also have 6gb of freespace in my hdd...

please help! that world is so important to me