Stuck with read-only repo while doing repository cleanup

I am doing a repository cleanup to my company’s private repo (not self-hosted, free plan) following the doc: Reduce repository size | GitLab
The company uses this repository for 9 years, it has 16K commits.

The ‘commit-map’ was too big, so I split it into 6 pieces as the manual suggested. The first piece was processed instantly. The fourth took 7 minutes. Now I’m on the fifth piece - it took 16 hours already.
I truly believe it’s stuck. The repo is unusable since it’s made read-only by the cleanup script.

Is there any way to inspect if any tasks are running for my account?
Any way to fix this?