I hope you are well, I will be happy to help you with this!
Upon further review, it seems that you left the organization, therefore lost access to it, I apologize.
Unfortunately, due to privacy and security, we do not have the ability to add you users or yourself back to the organization. Although, I noticed that you were able to successfully create a new organization, I would recommend keeping working with this one moving forward.
Please feel free to let me know if you have any further questions, I am here to help!