You can use ICO list market site like tokenmarket.net, this site pretty famous, you can listing your ICO project there for free.
There's a lots of forum which also related to crypto that you can advertise your ICO project mate I'm sure Google will help you out to find those site just simply key in the magic words and it will give you the list of crypto related sites where you can post and advertise your project.
But most of them are paid, isn't it?
There are a lot free forum which you can start promote your project, for example: allcryptotalk.com cryptotalk.org and ect.