I am looking for advice. Which coin is the most profitable in 2019
Any coin that has a higher value right now could be profitable. One day, the prices are so high, one day it all goes down. Buy and sell tactic is not so advisable and the value of the coins could go all time low just by hodling it.
actually the exact opposite is true.
all the altcoins that have lower prices have always been a lot more profitable than those with higher ones. for example a random shitcoin that is worth 1000 satoshi could get pumped to 50000 (50x rise) easily while a big coin like ethereum will never even see a 0.1x pump.
and it has been proven that you can make the most amount of profit in altcoin market if you buy and sell coins in short term during their pumps instead of bag holding them which always leads to big losses.