It is a good one if you have followed it for awhile. Not every fall in price means "buy", some when they drop it takes a little or long time to rise again. It is advisable to monitor a coin for some time before buying it. I have some empirical experience.
Not just you who feel that and some people will have experienced the same thing until now. good analysis will make a big difference in your life.
The price analysis will give an idea about the out of the box view. Same things repeat every year but we are looking for Holy indicator which can solve all the price patterns with in a minute. BNB is definitely buy-in from my point of view.