question

You could use CloudScript, Segments and Schedule Task to achieve this in following steps:

1. Write a CloudScript that removes the data from current player, for example:

handlers.RemoveData = function(args,context){
    server.UpdateUserData({
        PlayFabId: currentPlayerId,
        KeysToRemove: ["KeysToRemove","AnotherKey"]
    });
}

1. Go to [Game Manager]->[Your Title]->[Players], choose [Segments] Tab. By default, there should be a Segment called “All Players”.
2. Tick the All Players Segment, choose Run task, it will jump to where you create a scheduled task.
3. Enter a Name, choose “Run actions on each player in a segment” in type of task field, choose “All Players” in Segment field.
4. In the Action field, choose Add action, then in the Type field, choose Execute CloudScript and in the Cloud Script Function Field, choose the CloudScript you wrote in the previous step.
5. Click “Save and run”.

Please refer to https://docs.microsoft.com/en-gb/gaming/playfab/features/automation/actions-rules/bulk-actions-for-an-entire-player-segment