it is very difficult nowadays to benefit from short-term trading,. even a 15% / day profit becomes impossible for the current price situation..
there may be some trading strategies that you can suggest here. bittrex is the place for me to trade
1. what coins you use for short-term trading
2. what time do you usually trade
3. how much profit you can with your strategy (profit / day)
Even if the daily profit does not correspond to your 15%, I think that it is not critical. Since if you take 10% per day, then a month we get 100% of the trade. Not bad, or you still not enough?)