question

>> Is there a way to make the statistic of all players in the leaderboard to 1000 (not delete)?

Yes, you can use CloudScript and Scheduled Tasks to achieve it. Scheduled tasks are a way to automate common game operation routines. Automated tasks can take predefined actions or execute CloudScript, which enables any custom server-side functionality you want to implement. To implement your requirement, you can create a CloudScript function that calls server API UpdatePlayerStatistics, then execute it for the “All Player” segment in the Scheduled Tasks. You can use this scheduled task as your custom “reset” plan. Please check this documentation for the details about how to create the Scheduled Tasks.

handlers.updateStatistics = function (args, context) {

    var request = {
        PlayFabId: currentPlayerId,
        Statistics: [{
            StatisticName: "Your statistic name",
            Value: 1000
        }]
    };

    var result = server.UpdatePlayerStatistics(request);
    return result;
};

>> How do I put players in a certain section?

As this section said, segment filtering allows you to define what players are included in the segment. You can define the “Statistic Value” filter to put player in the specific segment.

>> How do I bring in all the players in that section and grant them a reward?

As the first answer said, you can achieve it using Scheduled Task. You can add the reward methods in the CloudScript function and execute it for the corresponding segments in the Scheduled Task.