If you don't move to a music market and then put yourself out there then theres not much point in trying to pitch to publishers. 99.9% of the legit ones want to work with people they can talk to in person. If you're not moving to a music market then a simple acoustic guitar or piano demo would be perfect.

You can then find a youtube singer with a following and ask or pay them to perform your song. That is one way to get noticed without selling the farm.