Freelance marketing istant -stuck in the middle...?

I am a freelance marketing coordinator for realtors. I work for a local company and I istant agents too. I create flyers, brochures, postcards, presentations, business cards, enhance photos, do ad layouts, upload photos to website and do other web updates. My question is I feel I've hit a brick wall. I am not a graphic designer and I'm not interested in going to school for that necessarily. I work on Office '07 - Publisher, Powerpointe, outlook etc. and enjoy it but I would like to make more $ and offer more services but I'm really not sure what else I can do.