You wouldn't know the kind of coin they gonna fetch you money in the future. In order to discover such potential coin you need to sit down and make your own research about the potentials in the coin. Every coin in the market is a potential profit making coin. But they all have their period of bullish or bearish. If you study the coin's trend or fluctuations, read update around the coin you'll get a clue about the coin potential if it's okay to invest long or short term, and also spot when good to invest and and not to invest in the coin. Their is no need investing in a coin project when you aren't certain of it's future. Some people even go far to say, the best time to invest in cryptocurrency is when the coin is on bearish. But to make it clearer to you, if you don't have the funds that is adequate enough, you shouldn't just invest when the coin is going bearish, because their is possiblity of the coin sinking dipper. If you don't have the money to invest as it is going dipper, you'll struggle for long to recover your money that suffered out of the coin's bearish time.