So yeah while the naysayers may act like this means the end it's still on "life support" and the show's shown people coming back from this kind of impossible odds before

So the NBC feedback form is here https://help.nbc.com/hc/en-us/requests/new

Select “broadcast” under the drop-down menu, then on the next page, under feedback type, it’s feedback about a show. then, for issue type, you can choose (among other things) positive feedback (i.e. i love brilliant minds it’s my favorite show), negative feedback (i.e. shelving brilliant minds is a huge misstep), comments/suggestions/ideas (i.e. some combo thereof).