Recently Bitcoin got very high fluctuations. It went up 19,000USD(nearly) and dip to 12,500USD. In this situation does BTC stable ?
What are reason for that kind fluctuations ?
How long it will take reach 19,000 USD with this kind of market fluctuations ?
You already answered your own question.If Bitcoin fallen from 19000$ to 12500$ in few days then no,price of Bitcoin is not stable and the reason for that is because less adoption than fiat,price manipulation by whales,FUD etc.Now how long bitcoin will take to reach ATH again can't be said but it will happen surely sooner or later

Yes bitcoin is a stable currency thats why everyone they are joining bitcoin and banks are also accepting bitcoin and countries are also making bitcoin legal because bitcoin is now trust worthy and you can also invest here as much as you can which mean bitcoin is stable and thats why bitcoin get respect in market and I hope it will be same like this for ever.