First, calculate the market cap of ICO and compare it with the cap of top-100 altcoins. If it's cap is for example 30$m it gotta grow to 90$m to give you 3x profit. Also read the tech description of ICO and decide if it's unique and far-reaching. Look at the team and their past projects, find them on LinkedIn. Also the level of hype of this ICO is pretty important aspect, don't underestimate it.