DataStore Help | NOT using table.insert()

How would I be able to add a month into the DataStore dict? Without using table.insert()

DataStore right now:
image

Current script (btw when using this the datastore doesn’t change so that’s good, I just want to add a month to it):

local Data = {}
for Years, _ in pairs(GetData) do
	Data[Years] = GetData[Years]
end
pcall(function()
	ActivityData:SetAsync(Player.UserId, Data)
end)

What my DataStore Table looks like:

local DefaultTable = {
	[tostring(CurrentYear)] = {
		[Month] = {
			[TodaysDate] = {
				["ItemsSold"] = 5,
				["CommandsUsed"] = 5,
				["Hours"] = 5,
				["Minutes"] = 5,
				["Seconds"] = 5
			}
		}
	}
}

Does anyone have any suggestions on what I should do?