Repository Resizing

Hello together,

we have a problem with a gitlab repository.
Despite deleting the largest files, this is still far too large for the files it contains. Also deleting the files from repository history according to the guide (Reduce repository size | GitLab) didn’t help either.

We downloaded the repository files and uploaded them in a new repostory, this one has a size of 5.2 MB instead of 3 GB.

Does anyone have an idea to reduce the size?

Thank you