It is easy to get 10-15% ANY return rate, but the problem is that you will get that percentage in the form of altcoin and the value of this token/coin may decrease, or you may not be able to withdraw it, or it requires a large capital that makes the risk of losing everything very possible.
Therefore, instead of looking for an easy, unguaranteed profit, it is better to learn trading, as it can easily enable you to achieve a good profit, or at least DCA, for Bitcoin during the next 24 months.
But not all altcoins have the possibility to give you 10-15% return rate as most of the altcoins are here not to make us profitable but to make their own market profitable through our funds. Which means to clearly take advantage over our funds. This is why if we want to really indulge with altcoins, chose those well established and have high utility case so they won't get devalued easily especially when the market suddenly create a market crash or market price decline.
But if you focus on bitcoin, the worries are not that high even if we say that the risk is high. As long as you understand how bitcoin works and you never assume high consistent profits, then you are safe. Bitcoin is never a get rich quick, so one should only expect minimal profits but rest assured that you will never get scam or its value will end up in zero value just like what most of the altcoins have experienced in the market.