That's a big question. I guess I would say "it depends on what you want". The wording of your post indicates that you're looking for cash flow (although you called it earnings, which can be very differnt).
I'll make some assumptions. I assume at that comp level, your DTC property is a condo in DTC area, and that your wash park is a small SFR...maybe a bungalow or a condo? Both are premium areas, as you stated. You can truck along and make smaller cash returns and (potentially) larger appreciation. That's the game with those types of properties in those neighborhoods. I assume you aslo have some nice low rates locked in on those properties, which is very valuable as rates go up. A nice conservative strategy could be to leave those properties as is and keep chipping away at them. Down the line you'll have a nice equity position.
If you want to be a bit more aggressive and focus on cash flow, you can up your game to small multi family properties. There are duplexes in the surrounding areas with better cash fflow (6ish cap rates). Lakewood, Arvada, Littleton, Aurora. You could either 1031 your properties into multiple multi-families, or throw a HELOC on top of your existing to free up some equity.
Even more agressive is the suggestion to go out of denver and get a 20+ unit somewhere else. Lots of people on here making great returns out of state with this strategy. I only call it more aggressive because you will have a lot of leg work to do to learn other markets and you'd be leaving your comfort zone.
I personally like #2, and that's just what I'm doing. Small multi family in the denver surrounding area. Cap rates aren't what you get elsewhere, but I love denver and believe in long term growth here. I've toyed with the idea of larger buildings here 20+ units...but am concerned with the competition of all the giant new buildings that have hit the market. Duplexes get the market of people who don't quite want an apartment, but maybe can't quite afford a house.
Hope this helps. Just my two cents. There are probably thousands of other possibilities of where you can go next.