As indicated by predictions bitcoin should have achieved 15k$ by end of 2017 and fall in first week of jan 2018

In any case, shockingly its effectively reached 17k$ in 2017.

Should I purchase or hold my btc?I don't plan to sell at any point in the near future.
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of course its a risk.
Don't forget it is an investment and like every other investment you have the risks.
Make sure you understand what you are doing and most important do not put money that you can't afford losing.