There is no smartness in buying only at dip and hold in order to sell at high because you will only end up buying back at price higher than your selling point, and this is gambling, your are describing trading kind of strategy that's if I understood you correctly, the question is why are zooming out and looking at the chart again? It is Cristal clear that you sold for short term profit in order to buy back.
Read again if you don't understand. When you zoom out you will see Bitcoin has always seen new highs. Even though your current buying point looks high it doesn't matter because Bitcoin will go higher in the future. If you don't zoom out you don't see longer perspective and you make wrong calls. Read again newbie, don't make same mistakes as everyone else except a few people here.