No matter what pattern you are strumming, keep your down and up motion consistent. One practical thing you can do is to set an up “ceiling” and a down “floor.”
On the way up, make sure your wrist doesn’t go higher than your “ceiling” which could be any visual marker you choose. (Maybe the top curve of the body of your guitar, etc).
On the way down, make sure your wrist doesn’t go lower than your “floor” which could be maybe the lower curve of the body of your guitar.
This will at the very least give you a range of motion that you shouldn’t exceed when strumming, which will then improve your consistency.
Much Respect,
The Musician’s Toolbox
