I did much the same. I had nearly 3,000 hours fixed wing before I went rotary. I obtained the commercial with 50 hours but really did not expect a job of any kind. I owned a helicopter so built up 200 hours fairly quickly and took the flight instructor rating to find I was uninsurable as a flight instructor! I could fly photographers, rides, sightseeing etc until I had 250 in a helo. I bought a helicopter school so that was my job sorted out.
The instructors I employ seem to need the golden 1,000 hours in helicopters before they get a sniff of a job. It does not seem to matter how much fixed wing time they have, if you want to fly helicopters you need rotary time.
I don't think there is any short cut. You need to build up helicopter time and the traditional route is through instructing. It is not a bad job in itself, you will learn a lot and get to fly different types of machine and you actually get paid as well!
Good luck,
Chopperpilot47