App, 8k current, 24k total, 100 daily installs - let's analize what's happening

My app had steady growth of active installs until a few days ago, when downloads bumped to 300/day. After that the download rate is being steady. What happened?

I am also wondering if Admob is the right platform. Based on the screenshot below, what would you say, is it alright or not for these numbers?

Can you explain your question a bit clearer?

Well I have not so high downloads. I have in avarage 15-25 but suddently since 27 jun (I think) I have just 5-10 per day. So I guess the problem is not from your side