It would have been more better to say when the market dip will buy more (keep buying) and when it pumps will keep buying until the long term goals is achieve and that is what makes you an investor, the dip offers buying more Bitcoin at a lesser price compared to its previous high hence we don't just hold our asset in dip but see as advantage to more Bitcoin and not with the mindset of selling when it pumps, you sounded more like a trader than an investor. An investor maximize every buying opportunities by buying Bitcoin all the time until
they reach their targets.
Yes, it is good for an investor to ignore the market and buy at all times of the market. That is, you will buy at all times of the market, as long as you achieve the goal. This is the characteristic of an investor. An investor buys during the market decline and also buys during the market rise. When someone has the mindset of an investor, he keeps looking for buying opportunities at every moment of the market. They are not the ones who panic even during the market decline and decide to sell after a little pump. Rather, they consider the market decline as a profitable time to buy and try their best to increase the portfolio. Even during the market pump, they use the market positively and maintain continuity in investment without considering buying.
When someone considers buying during the dip or the fall and thinks it is best to sell during the pump or the market rise, basically they are not investing but they are trading. In such a practice, a person is always chasing short-term gains and putting their money at risk. Although long-term investments take more time, your risk is less and you have the potential to get more profit. What's more, your consistent investment will eventually take a shape that you never imagined.