Actually, all coin is profitable, for me even the shitcoin. All you need is the right timing. Know when to sell, don't aim for a bigger profit since in a less time, they could dump it when they make a profit. So you better do it first but of course it's very risky that's why others still prefer those leading coin in the market.
You view is completely risky which sometimes it is impossible to sell those because within second the market will start dumping the price. We have to participate in those only we have good experience in trading.
We should not look for profitable coins from our first step at market because we need some practical experience for this purpose you have to test your knowledge with less value coins and if it works then it means that you are gaining practical experience. On mirror side you will not face with huge loss if your knowledge is not working that is why I say to do with less valuable coins first.