No one knew where is the bottom , otherwise every one will be ultra riche , the market it's impossible to predict with exactitude every time , it's only speculation
Agreed. I saw often when deep smoothly became deep v.2 
But the main principal is do not seek the best entry point. It's enough a good point for you. If you think that time to buy is now it means a local bottom. Any advising can lead to loses. But with own decisions we can make mistake self only