I am a user researcher in an early stage startup looking to learn more about how app publishers handle app store designs and copy optimization.
I would reach out directly, especially to some of the gaming companies who have got this process down to a fine art. Network on LinkedIn and you'll be surprised how helpful some of these folks will be, especially in the nordics where there is a very open culture of sharing , even in some of the biggest players. Hope that helps.
I would reach out to developers on LinkedIN or post a question on Quora. Or if you have specific needs I would be willing to set up a call and talk to you about app store optimization.
There are people here on Clarity that say they specialize in this. Hit them up!