Before I get into this it is important that you know the points A and B are not valid wave tags but are only on the chart for illustrative purposes.
When I first got into the markets, I found myself sticking to a bias based on any first sign or pattern I found on the chart. The beginning of my forex journey is a story full of losses and blowing of accounts. But that is a story for another day.
As time went on I observed and realized that the market is dynamic and hence different patterns develop as time proceeds and most time these patterns interact with each other. Since this revelation, I've been able to effectively know when to exit a trade and when it's safe to hold a position until it hits my target.
Citing an example above with the CADCHF. I took a short trade from point A about two weeks ago following the rejection of the upper weekly trendline and a break of a lower timeframe ascending channel. Riding to point B I realized I was approaching an area which has previously served as support and is in confluence with a lower daily trendline yet to be confirmed. But I decided to hold on bearing in mind that there was a possibility to break those barriers at the time.
As you can see price bounced from Point B and naturally one would panic and dump their position, but not if you know your stuff. Instead of leaving I moved my stop loss right above the suppl zone as you can see on the chart because a break above that would indicate a move to the upside. Observe how price rejected that level and formed a right shoulder right at the supply zone showing that the market wants to move lower.
This is how I effectively manage all my position- constant analysis to check for confirmation and invalidation levels. This is how every trader should treat their positions...with care and attention :)
Hope you all take something out of this.