if in 2019 will begin a fast rise in the price of bitcoin, then most likely I will sell bitcoin when it reaches 25-30 thousand and then wait for 10 thousand to buy it again
I like your optimism. Do you really think that Bitcoin will make it to $25K in 2019? That will be the most amazing thing that can happen in the year. I am not a pessimist, but I don't think is realistic.
maybe that could happen sometime but I am not sure that in the near future it might take a long time to reach $ 25K because this year the market increase is not so significant