I suggest you to save it , you can make alot of money , BTC price seems to grow and grow and its stable
, Or you can do altcoin trading , 1.5BTC is great for altcoin , but you need to be smart and earn knowledge about altcoin.
That's it is better if you are just going to save and if there's a sudden fluctuation of price. Like even small increase for sure you will feel a big effect
on that amount of btc. And once you think it is enough that your 1.5 btc earned from price increase.
Then it is the time to think about like trading and other profitable investments except hyips.