HTTP 500 error when attempting to publish a place

I am trying to solve it for three days now, almost no luck though.
The place I’m working on is pretty big and it’s pretty much halfway done, but three days ago I noticed that I cannot publish any changes made on the place. Today I found out that the game’s RBXL file weighs about 143 megabytes, it also doesn’t belong to me. I cut off the pieces of the map I don’t need and got 118 megabytes, I thought I solved the problem.
When I got to work to do the same thing, to replace one kind of a model with a newer one, for the fifth time I couldn’t upload the changes once again, the file’s size went up to ~132 Megabytes, each of the models being ~4 megabytes big. Except now I can’t cut any more.
Literally moments ago I tried reuploading the place itself, but instead of publishing the place it just created a baseplate with no traces of the place itself in it.