My First 10 Customers in 10 days after Launch of RetroTeam

I just launched https://RetroTeam.app I had kept an email list of folks (20) whom I had communicated my idea to fix retrospectives in the new distributed world or remote work.
I also wrote a bunch of blog post about retrospectives.

The day before Launch I email these folks and posted my blogs on LinkedIn and other social media.

Email got me 3 users and 7 came from LinkedIn, the other social media failed with 0 users. I will be embarking on Twitter next and see if that brings any users.

I will have to build a user following on Twitter to get any traction. Has anyone been successfully growing twitter organically, if so can you share?