That only means personal development affiliate programs aren't the best market to target
You mention that you have a music-related blog - there might not be as many people seeking that type of material as there are with personal development, but that can make it a better place to start. Just remember why people are interested in it - unless the writing is very compelling people will come to it because they think they have something to gain related to music. If you want to make money it's best to set aside your preferences and look at how you can make the blog more interesting and valuable to people who keep coming back.
Remember that business growth isn't always fast or linear - sometimes it takes months or years of slow growth before you jump to a new level.