What do you do when the model says your favorite project (say the one that got you promoted or is getting you promoted) is a bad idea? Heck, forget fancy modeli

What do you do when the model says your favorite project (say the one that got you promoted or is getting you promoted) is a bad idea? Heck, forget fancy modeling, what does an excel sheet say? As old as the bible, the saying, "Physician, heal thyself!"