You do already have a business plan whether you know it or not. You have a system for doing things whether they're written down or not. Even things that you're less than passionate about, evaluations or hiring processes, can become more fun when you have the right steps in place. Identify how to make these repeated and predictable tasks more automated. Present them in a teachable form so that others can do them too. Then watch your business become something valuable to anyone and a commodity that you can sell or create new revenue streams from.