So out of fear, doubt etc some Investors sell their coins especially now that the market is a low price,
$63k+ is a low price? Well, if you're talking from the point of ATH, it's fairly low but if we look back at the history, the current price is reasonably high. It depends on how early you are in the journey. For early adopters, they're still in profit but investors that start late when the price is slightly higher than this are the ones panicking now.
I do tell my self in times like this that my profits are guaranteed (even if they are not guaranteed, it's just a way to lead your mind) and with that in mind I have no thoughts of selling , instead I buy more to get a better position.
This is what every investor should do. Profit is not guaranteed is a slogan to warn people not to invest what they can not afford to lose but deep down we are optimistic about the profit and that's why we keep investing even when the market is down. We believe holding long term guarantees profit.
You know investing in Bitcoin is not just only about investing, you also have to invest consistently (weekly) to get a solid position.
By investing consistently, I believe you mean DCA. That's not necessary for every investor. DCA is a good strategy for investors who can not buy at once. It allows you to accumulate bitcoin as small as possible instead of waiting to have huge amount to buy at once.