This was already solved in the past. Don’t just build a web site, build a community. This way the community will advertise the site and attract more users.
I know what you gonna say, but... ya... you knew.
I feel like the social media churn has destroyed people's brains, because they're more interested in stopping people from doing things they don't like than doing something awesome themselves.
I'm not saying that circumventing Google is the easiest thing in the world, or the cheapest, but it's not mission impossible either. I didn't find Hacker News from Google, not the dozens of other tech communities I'm following.