Many different scenarios could emerge. This could be a bear market rally. Or, the system may enter later just before a more important market rise. And so on. The bottom line is to be slow to pick systems and equally slow to give up on them.
Some systems are just theories and never worked.
In years of designing and testing systems, I'm amazed at the large number that do not work when tested. Some common indicators and systems are of absolutely no value whatsoever. A good rule of thumb is to assume that an indicator or system is worthless unless you have proof otherwise. Depending too heavily on a single timing system. Timing systems are not perfect.