Over-spending has been the doom of too many startups. Don't just grow for the sake of growing. Plan strategically and try to get your business profitable at least on an operating basis. More revenues does not mean more profits. Some things take money but there are other things that just require time. Sometimes, you just need to be around for so long for some things.

Keep the money in an FDIC-insured account, and don't worry about the interest. You need to focus on your business.