The best thing you must do is take more time to understand about bitcoin investment, or else research more so that you can perfect if what ideas you apply when you invest. You should know some strategy and this is the best that you do learn from your lose. Don't forget this two important the knowledge and skills.
YEs we must always have knowledge on what thing that we want to get it like investment, we will truly loae our bitcoin if we dont know whats happening on it and the strategy that common investors do. If you did a wrong decision the last time you invest make it as a lesson sonthat it wont happen again.