bitcoin is ALWAYS volatile. it has always been and will be for a couple of more years. that is no reason for not wanting to invest in it. in fact many traders are only involved in bitcoin because it is volatile!
additionally you seem to be missing the fact that when price falls down from an All Time High (ATH), in other words when it is in a dip, that is the best time to buy it. and now we are in a dip which means the best time to buy bitcoin and hold it.
it is pretty simple! when price has fallen 67.5% (current level is that much lower than ATH) there is not much room left to go lower. it may fall down to 70% or a little more but we are near the end of the drop for sure. and when we reach that point, there is nowhere else to go but up,.... eventually.
It was shown clearly that 2-5% of portfolio allocated into BTC will reduce volatility of your holdings. It is strange that such a volatile asset as BTC works as good hedge against downtrend of your traditional assets.