If your local repo on your computer contains all the latches of your private remote fork, you should be able to remove the private remote fork, create a new fork of the correct repository up, and then simply push all local changes to the new private fork.
I would like to note, however, that if you have any pull requests / problems made to your private remote plug, then you are likely to lose comments for those who remove them. You can save any push requests that you have already combined into your private fork (and loaded into your local repo).
As for requests to receive requests to your upstream repository, as long as they are merged into an upstream repository, you do not have to worry about losing them.
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