In this case: reminding myself to go fast, fast, fast in 5-0 blitz games. Things to remember don't get much simpler than that. Just a little over 24 hours ago I posted my last Chess Log post, and at the time, as I remarked,
"I haven't been playing very well at all lately."
I'd lost over 100 rating points in just a day or 2. Then I remarked that I'd been losing lots of games on time while having the better position. So I just told myself: "Go fast, fast, fast," and for the past 24 hours, for the most part, I haven't forgotten to do so, and I've gone 12-8 against highly-rated opposition and gained 70 points.
Oh, actually, I've reminded myself to do 2 very simple things, actually: go fast, and not assume that I've won until I actually have. The two things often go together: I gain an early advantage and get smug, assuming the game is already won, and before I know it, a tough opponent has been playing so much faster than me that I've got 10 seconds or so left against mt opponents 1 1/2 minutes... and I lose on time. Because I got smug and assumed I'd won before I actually had.
PS, 2:33 PM: And sure enough, as soon as I posted about how great I am at chess, I started another losing streak. Overconfidence messes you up in chess, every time.