15% a day? Mate you are craazy, it is more than impossible and i am more than sure in that you are never goign to be achieving those numbers in less than 24 hours. Take inconsideration that we are still on a bear market, the volatility is more than high
in the altcoin market where there is at least a dozen pumps every day earning 15% profit per day is considered nothing! it is actually quite easy to do if you master the market and learn how to detect these pumps before it is too late and get on board to ride the manipulation partially to the top and make your profit.
whenever you are in doubt go to
https://coinmarketcap.com/all/views/all/ and sort the list based on 24 hour change and see the daily pumped coins.