Sorry for the delay- don't know if anyone here can truly answer your question. Most theatres will go with SMs they have worked with before, if they like working with them- and who can blame them? Without knowing you, it's hard to say what you can do better- do you mostly ASM for larger theatres? or SM for smaller theatres? It might be worth branching out- if you need to get contacts at larger theatres, apply for PA positions. Or, get some experience SMing at smaller theatres that aren't community theatres. I don't know what the Denver theatre market is like, but find a gap in the market and fill it. Look for job postings in your area- maybe you've been cold calling theatres that aren't hiring, or only hire former interns, or whatever.
My personal opinion is that you can find qualities in many different jobs that have facets supporting stage management. I think the key is to find the parts of those jobs that will help you in stage management. My very first job was working in a bookstore- I managed summer employees and was responsible for keeping up with orders and paperwork, and I think that experience made me a better stage manager. But, depending on your experience, you might get more out of working for a theatre in a different capacity and let them get to know you- work for the box office, or do carpentry. A non-SM job might mean a different way to "get in" with a particular company.