Wave 5 rule "end of trend" - Anything at the end of the wave has a chance to fail. - Wave 3 extends more than 261.8% of Wave 1 and Wave 4 retraces more than 38.2% of Wave 1 + Wave 3.
advice - The last wave should only play 38.2% for safety. After that, you should wait for the end of the trend and then play on a down trend.