I put together a qualifications website 2 months ago after researching and finding a lucrative keyword using Market Samurai. I've been in third position in Google search for this keyword for a while, which I'm happy with for now, but I notice that Adsense is not really working for me. Some days I make a few dollars, some days nothing, so I'm wondering if there is anything else I can do? I've had an email sign up in exchange for a free PDF, but these qualifications cover so many different subjects, I don't think people are encouraged to sign up. I guess I've learnt that it's not just about finding lucrative keywords, it's about thinking ahead and ensuring people will find value in your site.
Any suggestions on how else I can monetize a website giving information on obtaining qualifications?