Hi, @eevee911.
EDIT: apologies for the misleading answer below. This similar thread has an accepted solution you might want to try: Cannot Reduce Repo Size - #3 by gitlab-greg
Since you mentioned the housekeeping task, I assume this is your self-managed instance. Did you try the Clean up tasks?
Do you need to configure the default artifacts expiration?
Are you using the container registry? This is also an usual culprit for high disk usage and has its own garbage collection task: GitLab Container Registry administration | GitLab.
I hope these help but, if they don’t, this page can help you determine what exactly is using your disk space: File Storage in GitLab | GitLab