Before talking about SEO, you need influencers to bring the first visitors to your websites because no search engine is not going to recommend a new site unless it is loaded with high traffic. And also the content needs to stand out, if it is just similar to the other websites doing then you will be shown in the down order or after few pages.
How to get organic traffice without ranking keywords on search engines?
If I am not wrong, you will never any growth without advertising your websites, first you need visitors then it will boost the contents for the more people then only the keywords on search engine, etc.
I don't agree with you on this, Organic visitors mean organic not paid visitors. According to my understanding and knowledge, Paid campaigns don't boost organic results. Most of the websites don't go with paid campaigns and they are getting good positions too.