Tasting success for the first time, but wondering how to optimize

You need to test this, since we don't know the niche, we can't say if it will convert better or worse. Depends on the niches metrics also, is it a hungry market? How much money usually the buyer spends in the niche and how often? Those are questions you need to ask yourself everytime you wan to enter a niche/change a product.

What other trustful and tested affiliate programs are there besides CB
I want to start by creating Squeeze P but I still haven't found a niche to go, and also would like to know more affiliates than just CB

Thanks