i exit trades when the prices closes on the other side of a right-displaced 7-period moving average of the typical price (it’s displaced forward by 5 periods)
the “typical price” is the total of the high low and close divided by 3, but i think that just using a more conventional 7-period moving average of the close displaced forward by 5 periods probably wouldn’t be significantly different
it works well for me
i’m occasionally willing to vary it according my perceptions of recent support and resistance, so i don’t regard it as “written in stone”, but i like it as a general rule and i’ve stuck with it for many years, now