There was no need to cancel the application as an outland application can still be processed even if the sponsor and PA are in Canada, or if just the sponsor is in Canada. IRCC won't 'shift' an application if you move.
For you to do an inland application, you (the PA) would have to be in Canada and it sounds like you're still in the USA, so outland would be your only option actually.
Your best bet is to contact IRCC right away (try calling) and follow up via e-mail to not process the cancellation of the application if you'd like it to continue; but you may have to start over from scratch again if they've already withdrawn the application from processing.
The phone numbers are 1-888-242-2100 or 1 (613) 944-4000 and follow the menus.