Trading completely depends on your own skill. The more skill you have, the more likely you are to profit from trading. Most of us traders take trades based only on a guideline rather than using our skills. The guideline is that the price of a coin has gone up a lot and has gone from a lot up to a lot down. But the trading system does not follow this principle at all. A person has to acquire adequate knowledge about trading only then that person becomes fully skilled about trading.
The only skill one needs is buying low and selling high. Keep patience through through the price changes and you will do well in the long run. Trading is a long term game not a one day affair hence patience becomes very important.
This becomes complicated if you are going with altcoins trading and not keeping yourself limited in the number of assets. The altcoins carry higher risk and the risk appetite of every person varies. Traders learn this over time and it's vital to recognise - most traders can handle the stress only if they are doing this well.
But it is not an easy thing to just know you need to buy low and sell high. How can you execute that if you don't know when the price of the market will be considered low now and later on it will go up? The core skill a trader should have is critical thinking. A trader should be able to come up with his or her own technical analysis, applying the things he or she learned, indicators, trends, and many more ways in order to come up with a technical analysis that you will follow and execute, and if your predictions are right, that's when you can say you buy at the low price of the marketof the market and are ready to sell at the high price. Don't make trading as simple as that because we know how risky and dangerous it is. About the OP, we can't understand what the meaning of "profitable system" is. The OP should elaborate on what this "profitable system" is, what it does, and how you can consider it to be profitable?.