Looking for advice on how to get this team winning. I feel like this team should be much better.
Franchise Profile: Nats - Hardball Dynasty Baseball | WhatIfSports

Your team strikes out way too often. So your combination of batting eye and contact needs to be improved. Also, your SB-CS ratio is only 2-1, which is not very good. I would try to lower your stolen base attempts (rare or never), and set hit-and-run to never. See if that helps.

Try to trade one of your speed guys for a guy that can get on base. Then lower your stolen base attempts. This will help your power hitters drive in more runs over the rest of the season.

You can't hit. Your team OBP is .302, and the power is mediocre. And you're in the DH league.

There are two reasons, one reasonable and one not, why you can't hit. The first is that you've sacrificed offense for defense at C, CF, and SS. This may well be a good choice, and has had some benefits-- but also some costs. The second is that you haven't found adequate solutions at 3B, LF, RF, or DH. As a result, you have only two good hitters; the 2B and the 1B (the DH would be an OK hitter for position if he could defend LF or RF, but he can't).

There's no quick fix here; you'll have to upgrade all those positions in the offseason.