I can't make this script work for certain group role 3+, just for all members?

My script adds 1 point into a player leaderstat every 1 minute if they are in a group. I have tried but I cannot seem to get it to only give it if they are rank number 3 or higher. Can someone please help? Here is the script:

local DataStore = game:GetService("DataStoreService")
local ds = DataStore:GetDataStore("CashSaveSystem")

game.Players.PlayerAdded:connect(function(player)

    local leader = Instance.new("Folder",player)
    leader.Name = "leaderstats"

    local currency = Instance.new("IntValue",leader)
    currency.Name = "Points"
    currency.Value = ds:GetAsync(player.UserId)

    ds:SetAsync(player.UserId, currency.Value)

    currency.Changed:connect(function()
        ds:SetAsync(player.UserId, currency.Value)
    end)
end)

game.Players.PlayerRemoving:connect(function(player)

    ds:SetAsync(player.UserId, player.leaderstats.Points.Value)

end)

game.Players.PlayerAdded:connect(function(Player)
    wait(2)
    while true do wait(60) -- Time between giving points
        if Player:IsInGroup(3992679) then -- Group ID here
            Player.leaderstats.Points.Value = Player.leaderstats.Points.Value + 1
        end
    end
end)