Marketing Strategy for a mobile app -where to get started?

I've been building on my mobile app for freelancers for a while now, and only recently started to understand the importance of a good customer acquisition strategy.

V1 of the app has been available for a few months now, and it's no surprise that user adoption has been slim to none.

So over the next 2 weeks, I'm "laying down the coding keyboard", and spending some dedicated time on how I should be attracting freelancers to try (and then subscribe) to the app.

So far, I've outlines some principals:

• content should be helpful
• demonstrate value / solutions
• zero-barrier to experience
• be discoverable (web and app stores)
• can I measure it?

... and a "guide graph" to try and trim down the list of marketing tasks to do:

I only have an average of an hour a day total for all my indie hacking activities, so I'm super conflicted on where I should be spending my time.

Better Website / Blog posts / Free online tools / newsletter / direct sales / paid advertising / community involvement - so many options my brain is hurting :P

If this were your app - what would your strategy be / where would you start?