Few months back i purchased arround 15 to 16 btc when bitcoin price was 10000$ to 11000$ each btc but now arround 4000$ each btc .Just waiting for 11000$ for each btc than i should leave btc and i can see bitcoin have no future in this time.
my advise for you:
1- Sell half of your bitcoin
8
BTC at the current rate 4 k so you get $32k
Place an order to buy 5
BTC at 3K that is $15K
Place another order at 8.5
BTC at $2K that $17K
Set SMS alert to watch the price if it goes above $5K or $6K it means its going up
so you may cancel your order and buy at higher price
but most likely it will goes down to 3 or 2 then recover
keep waiting
BTC will cross 19K again for sure its just a matter of time