Should I add more schools?

I was wondering if it would be a good idea to add a few more schools, and if anyone could give me input of which schools to add. Because of financial constraints I only applied to four originally, but think I could add some more if it's not too late.

My GPA is 3.8 overall and science and I got a 510 (128/126/128/128). I've applied to RVU-CO, KCU, PCOM (don't meet their LOR requirements) and DMU.