Taking high risk doesn't guarantee you a high return every time. It is a really ridiculous saying I think. If you fall for it, there is a high probability for you to lose maybe all of your investment amount or most of it. In this market, taking higher risks can take you to really interesting places. So I think that the best thing to do is to make a regular investment into some coin and go on with it. 
And for me, take only the risk if your gut feel is saying that the project is worth venturing with. Don't hope for miracles to happen, because it won't. There are some indications if the project will hit it off such as - they are sold out fast during ICO/IEO or any crowdsourcing campaign, they have working product already with active users, the team members are well-known in the industry, they have top companies on board, and others. But aiming for return multiple times of your initial investments is not a guarantee as it may take time to achieve in that position.
The easiest way to see a successful ICO or IEO project is the amount of money they get, of course right now it is difficult to sell up to $1 million due to a lot of project competition, even now with only 10 BNB the project dares to continue, of course they need investors who have large capital to be able to finance their projects.
