That’s one of the hardest questions to answer, especially these days.
Assuming you have given all the programs you promote equal exposure levels in terms of spots, traffic and time. You should know by now which programs are the most profitable for you in both conversion and retention aspects.
If you want to “drop” a program but not sure about it. Why not simply give it lower exposure for a few months? You can always give such a program another chance a few months later.