TarionzCousin
Second Most Angelic Devil Ever
What is one thing that you would recommend that other DM's do? It can be something you do well, something you wish you could do better, something you've seen done, etc.
I would recommend "The Pause."
When your players are discussing what's going on in your game, don't react to what they say. Some of them will be throwing things out there and looking at you out of the corner of their eyes to see if you bite. Keep a straight face.
This also means don't jump in to suggest something. If you've done a good job at planting clues, another player will usually say what you were thinking after a moment or two. It's their game, not your story. Let them decide what to do.
So, what is your "One Thing" suggestion?
I would recommend "The Pause."
When your players are discussing what's going on in your game, don't react to what they say. Some of them will be throwing things out there and looking at you out of the corner of their eyes to see if you bite. Keep a straight face.

This also means don't jump in to suggest something. If you've done a good job at planting clues, another player will usually say what you were thinking after a moment or two. It's their game, not your story. Let them decide what to do.
So, what is your "One Thing" suggestion?