Look for projects with a good profitable idea with growing market demand.
There are also some good cryptocurrency blogs with regular reviews and comparisons of recent ICOs, for example, here is a good recent one, all their previous advice seems trustworthy: 5 Moon-shot ICOs set to shine in April and May 2018
BTW, his top 5 ICOs to invest in these two months are:
1. LCCX
2. Truegame
3. BitRewards
4. Minerva
5. XTRD