hi,
i am not one of the guru's of this business may be but, i have some thoughts on your situation my friend,
first and most important thing is quality of the photographs, which in your situation, they are great,
2: are they stock oriented or not, where will the potential customers will use your image? think about this before starting to shoot, and while determining your subjects and concepts always and always check out different sites with these concepts, what did people do about these concepts before you? which ones of these sell, which ones dont sell? try to shoot for micro stock only, your previous images that you shoot begore meetin micro stock may be awesome too, but most probably they wont sell.
3: keywords - may be as important as first two, it is the only way for customers to find out your images, so always double check different keyword combinations which can be usable for all sites, this keyword subject is the main reason why some photographers do extremely well in some sites, and cant sell on others
4: patience - i dont know how long have you been submitting to micro's but, y have to work very hard before things start to change for you. don get my wrong in any way that i am talking about your photographic knowledge or something, what i try to say is, every stock site has different characteristics and it takes time for you to learn these stuff. especially if it is not your full time job, y wont be able to catch the full time micro stockers in 6 - 8 months, who has been doing this business for more than 2 years. some of them are working very hard, every day and even nights to catch up the development of this business