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I don't have a direct solution to show all activity of the last 90 days.
We have made an app (Organizr for Bitbucket) that show pull request activity across all repositories of your instance.
You could use the app to list all pull requests by updated date which will point you to all repositories which had pull request activity in the last N days.
Not ideal, but at least you get a rough idea which repos are active.
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