There  is different between investors and traders .. Investors are the one holding their crypto  at this bear market time and the trader who are afraid to lose are selling their  crypto  as cheap price .. Investor will never sell  at cheap because investor  are  ready to hold for long period of time .. When bitcoin was created in 2009  miners who were investors  are now millionaire  and other  who were  traders sold them at cheap price  ..

Few people started selling their crypto because they think the value is not growing as per their expectation and couldn't hold the coins for longer time without getting benefit. i think if the value of btc is not improved much in 2019 then there might be the chances of lot of people will sell their crypto and the market might be in tough situation.

you can't tell everyone that selling their "crypto" is wrong because for majority of them it is a correct move. consider the case of someone who bought an altcoin in its dip after the huge dump that we had a couple of weeks ago. for that person this recovery which is a good rise after that low is a good place to dump that altcoin before it gets dumped on him and he loses his chance.
or for a day trader who has been doing this on every up and down, selling after the "up" is a good choice so that he can buy back when the "down" came. of course in this context up and down can mean something like sell at $4010 and buy back at $3990. rinse and repeat. (just an example though).

Many crypto that have become dust prices have fallen many times over. An alternative that might work without selling it at the lowest price is holding or waiting for the right time to sell it at least when the price is not far from the initial price.

I am of the view that financial markets move in circles.   Time taken by a circle to complete one round may take different time which depends upon different market circumstances.  So as per my opinion ; there is one certain upwards movement of price after the fall of the prices.  Bear trend follows bull trend and bull trend follows the bear one.

I see almost all the people here writing in this thread are positive minded people.  Their writing indicating they are hopeful about recovery of prices in little long term may year or two. 
Most of the people writing positive words also shows that negative minded people already left and are already out.    Otherwise there must have been some negative views also about the markets. 

These sellers might have lost their faith in their coins and they are also afraid of another sharp price declines this year or they just badly need some money. Many investors are still positive about the growth of cryptocurrencies this year but there are also skeptics and they believe that declines will continue. I believe that it is a good time to buy coin while they are still affordable and time to hold more if you have coins instead of selling them this early.

There are many people who are selling off their crypto. There are some people who has not enough patience and want to make profit very early, they become depress about crypto and sell off their crypto. Some people lose their trust about crypto because of price falling and sell their crypto. People also sell their crypto for their needs.

There is no alternative. Now is the time to buy only. Bitcoin will not be able to go even lower. Those people who are selling bitcoin now (or other coins) make a mistake. It makes sense to wait even at least half a year. Then the direction of the market will become clearer.

The only ones selling now are the traders. Those who suffered from FUD
have already sold. They are probably looking at the markets now and
realising their mistake.

Its a buyers market now.

If me i will look for real job that can give us salary, fixed salary. And since past, we know this business can't be main salary because we don't know when price be good or not. it is better to prevent our loss.