There are plenty of adult hockey leagues in Denver. A simple Google search shows the Rocky Mountain Hockey League (RMHL), the Denver University league, South Suburban, Big Bear, and others.
https://denverplayshockey.com/rink-info/edge-adult-league/
https://icecentre.com/programs/adult-hockey/
Depending on where you are, some options might work better for you. I hope this helps you in getting restarted.