To put it all toghether from @grawity answer and the Post I linked in the first Post.

1. Clone old repo

2. Clone new repo

3. cd into new repo

git fetch ../oldRepo master:ancient_history
git replace --graft $(git rev-list master | tail -n 1) $(git rev-parse ancient_history)
git filter-repo --replace-refs delete-no-add --force

Then i pushed it to an newly created Repository.