There are also trades. Like the Phillies did for Luzardo. Sometimes you have to get creative.
I thought the Lowe trade was excellent. He is way overdue getting hot for a month, but for now I am sticking by that was a very good trade. But past making a move for a DH I am just not thinking about, I don't know the other move. They weren't blocking House at 3B, they bet on Abrams at SS, Garcia wasn't going to be replaced after 2024, and the OF is packed as is.
Catcher is an obvious, but if we're grumbling about offensive production out of catcher then we have bigger issues. Fangraphs shows Nats dead last in oWAR out of catcher, but OPS we're not far off average in OPS at the spot. I think Ruiz's biggest problem is they're riding him into the ground when Adams and Millas both seem to me to be perfectly adequate backup catchers.
In the rotation, I think it's possible they were too conservatives. I wonder if the right choice would have been let Williams walk, pass on Soroka, than they have ~$25 million to go and find a better mid-rotation pitcher.
If the Nationals have a good stretch and approach the deadline not in a position to blow it up, I'm wanting them to get a backup C they trust and more middle inning arms. Both attainable. I don't see them taking a big swing at DH when Wood may need to go there and rotation-wise probably still like their overall options.