yes there has been a huge fluctuation in the market of bitcoin, but now if you check out July 2018. It has been really stable. There can be a bubble, but who knows when will it burst.
It's true I was so happy with bitcoin my money was increasing day by day then
I thought it will increase more most of the predictors said it will reach up to 50,000$ per BTC.
But it never happened and i realized that listening to speculators is the worst thing you can do.
You should take opinion from everyone, but you should take your own decision, to me i think that the predictors were very true in their sense, becasue at that time no doubt it was expected that bitcoin price is going to touch 50000$, but unfortunately the bitcoin price return and the price fell down too much, but if you are still holding your bitcoin then you should wait a little more and very possible that you will see the price again trading above 20k, which will not only recover your lost but will also give you a very good profit.