Advertise on Google for now is difficult because they prohibit advertising ICO because of the many ICO scams, maybe social media is another alternative that has a positive impact on attracting investors, the gift also plays an active role in introducing ICO products. Making seminars or activities in each country is my proposal to attract more investors.
An interesting point, some people write that allowed advertising, others argue that banned. I know that advertising products is a very complex process, usually you need to identify the audience and create contextual advertising. If there are still bans, it will be extremely difficult to promote the project. How to find out whether advertising is allowed or not?