I will soon be hiring someone to build me 3 apps, but while I do that, I am building out a solid marketing plan.
You relying on having the play store page as your "landing page"? My plan centered around building a landing page on my website for each app, somewhere I can talk about my app, provide screenshots, talk about tricks within the app, provide value. This allowse to funnel more users from some longtail SEO, plus helps troubleshoot issues before people feel like uninstalling and such.
My other part is I have been building up relationships BEFORE my app(s) are even developed. Comments, direct conversations, all of it,so some top influencers will know me when I launch.
I also found some top newletters in my niche, and will be buying posts on them.
Plus much more. Even with little money you could do some of this,and a lot more.
You can check out my journey thread for more information on my plan.