Did you confirm buy rate MF on Edmunds along with any potential incentives for your region? That discount looks weak at best.
You’ll also want to get these two packages removed, that’s an extra $1000 right there.
You might need to expand your search radius and be prepared to go outside the state. Off the top of my head I recall a recent post by a MB dealer in NorCal that had some nice loaner options for substantially less money - I’d search for that post and consider reaching out.
there are many brokers on this forum, you can start with the marketplace section and look at what’s advertised. Not sure if there are CO brokers on this site, but you’re not that far from CA, many really great deals come from CA, might be worth getting one from a broker there and have the car shipped.
I’ve seen one decent deal on a c class here in Denver, it was posted in the trophy garage earlier this year or end of last year. Ironically that person was from out of state. You might look for loaners too, I’ve seen them on their websites. You might try going back and forth with all the different dealers, you might have to just grind on them. Target cars in stock for awhile(cargurus site)
Another tactic is to build out your own deal and say you’ll do it for X amount.