How to grow your community in 30 days. Step by step daily plan?

Hi Everyone, I am planning to draft a 30 days challange where users can follow instructions emailed to them every day for 30 days.

This will help them to grow their community irrespective to their niche or sector.

What is your approach to grow your community?

1. Do you joing facebook groups?
2. Do you connect with users on reddit?
3. Do you write content and optimise it with SEO?

Let me know your tactics and I will includ them into my 30 days newsletter.

Looking forwrad to hear from you soon.