Repository size is still large in after clean up was completed

We have this repository: https://bitbucket.org/agencesoon/0421-tbs.\\
After I clean it up git count-objects --v shows:
size-pack: 70443. However Bitbucket reports " This repository's size is over 1 GB. Read more on how to reduce the size of your repository. " Please help me to prune it.

Thanks,