I wish you luck but unfortunately there are millions of men in your same position. Men are a dime a dozen. Women are hard to find. I know because we have been looking for one for the last 5 years coming of a 38 year poly triad with a shared girlfriend.
Thinking about this, poly is not just group sex. I am an old timer and it just seems to me that poly is being used to describe sex with more than one person. It is almost like people are giving the things we did and labelled differently, a mantle of respect by calling it poly. To us poly is a group of people all in love with each other, not separate relationships or threesomes. Most of what I read posted here are open relationships and three or more somes.