This is a great article where somebody systematically analyzed indie hackers interviews to figure out the best channels for user acquisition:
https://entrepreneurshandbook.co/top-15-acquisition-channels...
replies(2):
https://entrepreneurshandbook.co/top-15-acquisition-channels...
The list should go first then go on with "here's how we go to it" for those who want the details.
First who are clear with their destinations, and simply want the best journey towards it.
Second who want to know different journeys to finalize their destinations.
Majority falls in first set, but the article is written for second.