I think many investors are selling their Bitcoins now because the Bitcoin in 2017 is very high but when the 2018 enters the price drops because of holidays they needed their money. They start investing 2017 the value on that year is very high but now a days the Bitcoin is dropping they think that it is a scam but its just only many investors start selling. The perfect time to buy Bitcoin is now. Then wait for the price increase to sell it.

There is nothing to worry about, such movements on the market are normal. Especially for the cryptocurrencies.
And I think the BTC will soon not reach the December levels.

This is a normal situation , you have days when bitcoin goes up and you have days when it goes down 

I am new to this space, but I realise that this goes with the territory. If you are in  it for the long term, don't let the volatility distract you.

They can be obtained for a variety of operations and actions on the network. And not all of them require at least understanding of the essence of the crypto currency and the economic component of buying and selling currency.

Bitcoin price is always fluctuating because of news and speculation. I find this explaining reason behind the last price drop:

Ok. It looks like this thread is opened last January 30 and the OP is worried about the price of bitcoin going down. Fast forward and almost 2 months, we are still in the bearish market.

However, it looks like we are heading in a positive direction. Because I thought that $9K is not possible at the end of the week, but it looks like I"m wrong because we are almost there. Such good news coming from the G20 meeting that investors are pouring their hard earn money in the ecosystem. So I might chance my prediction and see $9K before the end of the week and possible $10K at the start of April, and start of a bullrun that we all have been waiting for.

Things are actually going well now especially since we heard the good news from the G20 summit concerning the fact that Bitcoins is not a threat to the world economy and am sure that because of that those who were panic selling have stopped and now it’s rising once again.

This sort of happening is constantly anticipated. Bitcoin is unstable and the cost depended in the request. In the event that the request diminishes, Well, expected that the cost likewise dropped. Be that as it may, amid cost diminishing, endeavor to purchase bitcoin and offer it at higher costs. On the off chance that you attempt to do this, I guarantee you that even the Bitcoin's cost diminishing, your benefit will never free and it will pick up a ton.