Should I sell my BTC or wait till it goes up and why do you think it will go up?
you can sell them now only if you need money, but if you don't need them asap then save them for later, atleast till halving, then price will rise so you could sell for much larger price
also if you like bitcoin and will sell all of your bitcoins, you will make price even lower, and low price is bad for bitcoin
Indeed, you should only sell them when you real need money otherwise it would not be smart and you will regret it.
The halving is also coming so I think it would not be smart, the price will rise for sure in a couple months.