Understand who your customers are. Tap into your network and see if you know anyone that can help—even to repost. Meet the people where they are. Look into Facebook groups, Reddit, LinkedIn groups, etc.
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does anyone have tips on getting an audience for your indie side projects? how do you market without having followers
Defining and targeting your customer is key. Traditionally using Twitter to #buildinpublic has been a great way to grow awareness, followers, get feedback, etc.