You’ll need to watch the video to understand the Monty Hall problem.
If you play the game, most people tend to not switch doors as they perceive the risk is 50/50. As you will see, it is not. As such, your intuitive logic gives you the wrong answer. So the first lesson is not to jump to quick conclusions when you think they are obvious.
Imagine there are 1000 doors or 10,000 doors. The logic shows its best to choose another door.
When you invest, you have over 10,000 options. The logic is that what you are currently doing, is not the winner. It pays therefore to change your mind.