Need help with my first startup

Hello everyone; I am starting a non-profit startup that aims to help people around the world quit any of their bad habits or harmful addictions in the most natural and habitual manner. This is my very first startup so I need advice on what I should do in the initial days and what to avoid. The MVP is ready which is a discord community and it's fully customized [I also got a few moderators to manage it] and there's also a landing page that I can share with my audience so they can get more information as well as find it trustworthy instead of just a spam link. Now; the next step is to promote it online to get audience so should I take some expert help or use related communities to spread the word? Also; anything else that needs to be done or avoided? Thank you!