The answer of this topic is YES beyond any question.
The key to this topic is how long will BTC be replaced.
Its appearance is a kind of revolution.
With the rapid development of the Internet, there is no doubt that more cryptocurrency will show up.
But nowadays BTC occupies more than half of the market of cryptocurrency.
So BTC will also be the king.

Recently i have recommended BTC to some of my friends.
I said it's a good chance to invest in.
They are interested before seeing its price curve。
Indeed, BTC is not stable.
And i know many countries ban BTC because of its some features, such as hard to be followed, which is beneficial to crimes

What I want to express does't mean BTC's price will decline.
We all know its recent price makes lots of people crazy.
Someone said this is a very suitable chance to invest compared to the history.
After almost 3 weeks' big rallies (from $7000 to $15000), it starts to fall by small steps.
Obviously, there are many topics about BTC's price, including what price will BTC reach to and so on, showing up in this forum.
I have to admit that i start to pay attention to BTC because of its high price.
We should keep calm to its price fluctuation and positive to BTC.
It's normal.

It's up to you. Though many people forecast that BTC will rise to $20000 or more, who can make sure it won't decline? It's hard to say. I suggest that if BTC makes you win what you expected before,  then you can sell them. Of course, if you are positive, you can hold it.

  As we all know, the recent 2 months, BTC has risen to $15000 quickly. This never happened is the past. How to explain this phenomenon?

Nothing is impossible. But i read many people's analysis, most of them suggested to hold it. Maybe its price will jump again.

I heard from my friend that a person spent 10000 BTC just buying a pizza in 2010. I thought he or she must be very sad. If he or she kept BTC untill today, he or she must become billionaire.

3 weeks ago i had a strong desire to invest in BTC but i gave up and its price was about $7000. From now on it has risen to $12500. I deeply regretted. But its price is too high, so i will wait for some time.

I started to pay close attention to BTC 3 weeks ago and its price was about $7000. And up to now its price was $12500, reaching it's peak. Is it appropriate to invest in bitcoins from now on？