https://www.similarweb.com/app/google-play/com.reddit.frontp...
https://www.similarweb.com/app/app-store/1064216828/statisti...
But you need a paid account to access stats older than 28 days, and this needs the 6-month view (or even longer, ideally).
Anyone here subscribe to Similarweb, and can answer for us? Or know of freely available historical app ranking stats?