Receptional - 5:29 pm on Feb 16, 2013 (gmt 0)
My advice would be to stop getting lots more sites and start to make the relationships with the sites you DO have link with much stringer. Try and get to know the owners on twitter/Linkedin etc and learn to know them on a personal level. Then - when you have something new worth saying - it is much easier to get that message out to a good audience.
If you do want to find more sites - there are many ways to do it... but again - seek out people that are influential in your niche - they will only talk about you if your content is up to the mark.