Ekk, 56 cents is not much but good because at least you earned something. Any niche is good as long as it is a topic that you wont have a hard time blogging about.
First of all you check your keywords competition in google.com secondly you check can your keyword ranking is better in google.com first page if not than you change your keywords and select your keyword which have highly competition than you do seo daily basis than your payment will upto 2 or 3 dollar par click and your daily payment will upto 10 to 20 us dollar apply
Traffic = $$$ 0.56 in clicks means your traffic is maximum 100/day do you whant to make/earn money with such low traffic be serious ... Get first serious traffic then complain about earning low ...