Grow a subreddit

I am looking for someone to grow a brand-new subreddit from the ground up and help establish it as a trusted, active community in Google's eyes. The goal is to create consistent discussion, engagement, and activity through high-quality threads that generate real participation and comments. Over time, I want the subreddit to build enough authority that when we create brand-investigation threads (reviews, experiences, "is it worth it" discussions, etc.), those threads have a strong chance of ranking in Google. Please explain your strategy for growing a subreddit from zero, provide examples of communities you have built, and outline what results you believe are realistic in the first 30, 60, and 90 days. I need reasonable orices and clear deliverables in your proposal