Choice of promotion opportunities?

Question

Android

A game application was written on Android and submitted to Google Play.
And then the question arose (which they didn’t think about in advance in vain) - how to find an audience?
There were few posts on VK (which had a very small effect), but on FB there was no response at all (and, in fact, the project was primarily focused on the Western market).
Maybe there are some proven methods, services and opportunities for promoting similar projects for new developers?
I seem to know how to use Google, but I almost did not find any useful information on the issue.
I understand that miracles do not happen, but I would like it without additional investments, because there is no budget at all.

Answer 1

habrahabr.ru/qa/18608/
habrahabr.ru/qa/24257/
habrahabr.ru/qa/40441/
habrahabr.ru/qa/41336/
habrahabr.ru/post/144359/
habrahabr.ru/company/apps4all/blog/ 147239/
habrahabr.ru/post/147243/
habrahabr.ru/post/149407/
habrahabr.ru/post/151905/
habrahabr.ru/post/161981/
habrahabr.ru/post/162767/
habrahabr.ru/post/164413/
habrahabr.ru/company/samsung/blog/171235/
habrahabr.ru/post/182138/

Answer 2

Well, basically they write that reviews on thematic resources help.
And so if you have no money you need to go to the publisher.