GDAX trading

How I made $4 from GDAX. I bought at$140 then sold for $160 of . 3473 litecoin which was a 20x trade. I did another trade with my dads help. And made$1 dollar trade by buying at 200 and selling at 205 with .2778 litcoin. So all together I've made $5 with the last two trades. I'm looking for the next great buy.