Since your projects space is too full to be able to run the commands to help lower this, you will have to wait until a staff member adds some space to your project to give you time to run the needed commands.
If you need to have this fixed now and you are 100% certain that there is nothing that you would need to undo with the rewind feature, then you can run
rm -rf .git in your projects console, and that will most likely completely lower the space usage however, I only recommend that if you have nothing you will ever need rewinding!
To stop your projects space from filling up all the time, I suggest creating a file called
.gitignore and inside that file, but the directory and/or file names of any database files or just any files that you have which are being updates regularly into the file, all on a new file! After you add the file, you will not be able to see the file in the projects file tree after a refresh, but it will be there, to make the file visible again, just remove it from the
gitignore and add it back once you are finished making whatever changes you had made to it, if any!
I hope this helps in any way!