Social Media channel is the most effective way now, specifically Youtube platform. Many prefer this platform because of the fact that it is easy to understand unlike on forums.
Yeah. There are many crypto Influencers now that already on Youtube. These influencers have already gained followers, so the chance that their followers might turn to investors.
Another thing is hiring professionals. There are many companies out there that is offering ICO development. Which means they will take care of your ICO project from start to finish, will do every aspect of the project.
What companies are offering these kinds of services?
Well, upon searching, here's the list of ICO development companies that might help your project. You can check it here. https://coinadvisors.co/2018/04/12/top-20-blockchain-and-ico-development-companies/. Hope it helps.