Bitcoin is a digital coin that is different from the fiat currency we know, bitcoin can be called a digital asset.
wow ... you are very lucky to be able to invest and get lots of profits.
Yes, I think bitcoin will rise again in 2019, I think you should immediately buy bitcoin now and hold it until 2019 and you will get a big profit, but if you are impatient you can play on a small scale but still be profitable.