You can request to be unlinked from your Dailymotion partnership at dashboard.tm. Once you log in, using both your YouTube and Dailymotion accounts, on the top right menu you just need to select “Unlink Dailymotion Channel”. 30 days after your request the channel will be unlinked.
Please consider reaching out to us to let us know why you are leaving by contacting support. We would love hear your feedback.