When I started C&M Group, I faced this problem head on. I started doing strategy consulting, product, SEO, business development, marketing, etc. to do everything "under the roof". Guess what? It didn't work. My suggestion would stick to what you do best, and try to leverage products or services around that. The last thing you want to do is have 10 different projects and services and trying to figure out how to add additional revenue. This will simply cause you burn out. Focus on something that has a need, validate it, and push it in the market.