be careful with 2019, where the existence of bitcoin is not in good condition, many people predict that bitcoin in 2019 will experience halving and low prices, before welcoming bulls from 2021 to 2023
I myself prefer to sell bitcoin while the price is above 3500 USD, and buy it when the price of bitcoin is in the figure of 3000 USD
This year's trading will be a little difficult, because it's hard to find the best loopholes to sell
You might be right about been more careful when playing ones cards in crypto currency investment or trading cause the crypto market is full of many possibilities but I also bet all on bitcoin and I dont see any reason why bitcoin halving will jump this year cause it something which is logical.