I reached out to hundreds of people via email. It was quite effective and the conversion rates were far above my industry average.
I started promoting six months ago because I wanted to build a following long before the campaign launched.
It's so crucial to get that email list.
If anyone is based in New Zealand, or where the website company Zeald is based, they will do a free website audit (worth $500) to study your website and your website objectives (e.g getting more newsletter subscribers). Then they give you a checklist to help you perfect your landing page, loading time, SEO results etc.
My project went live today: https://www.kickstarter.com/projects/sd ... e-magazine