range?
Yes.
I am not sure what you are trying to get at
What I am getting at is this: You risk ending up a bitter failed trader trolling trading forums whining and pissing and moaning about how TA sucks if you do not take seriously the task of understanding the indicator upon which you have staked your trading plan. Stochastics is about range and where price is within a range. If you come to understand how it defines a range and how it calculates a value for price relative to a range then you will have the key to unlock the answer as to why @Handle123 says that once a reading of <20 occurs after a reading of >80, the indicator has "re-set." You may still be unable to find the lock into which to place the key, but you will have the key should you locate the lock.
You seem to be looking for magic and there is no magic. It is the work of a disciplined directed intelligence that will bring about the understanding required to discover how to find and exploit a technical edge. You are still hopeful and so there is still hope for you. Don't be like these others who also gave indicators the Wizetrade "red light/green light" approach. You should be working toward understanding your indicator manipulates that data derived from price action. Making the attempt to understand that should help you better understand price action itself. And who knows? Perhaps you'll come to find that you don't need the indicator after all.