Go for the waiting of the mose profitable time when cryptocurrencies will be more stable and promising than they are now. I am sure that it will be soon.
now is the opportunity to buy because almost all altcoins experience price reductions, this is the best opportunity. what makes you doubt? do it immediately before prices will grow again, start investing in BTC or ETH.
My suggestion that if you're going to invest in ICO you need to conduct a research for you to avoid scams and in order to gain profit not to lose it. But, also investing in altcoins would be profitable as the ICO but the difference is much safer than ICO.