How can I improve this zombie wave module?

Help and Feedback Code Review
#1

Hello, I am wondering what I could improve for this wave module script. Right now it basically has a table of waves and what enemies to spawn, but the problem is I want to make it so I can skip the wave using a command and have it just do that wave without the previous wave stacking its income gain and then start the next wave twice.

function Waves:roundBonus(amount, waitDelay, wave)
	task.wait(waitDelay or 5)
	if not gameOver then
		local players = #game.Players:GetPlayers()
		for i, player in ipairs(game.Players:GetPlayers()) do

			if player:FindFirstChild("Cash") then
				player.Cash.Value += 100 + (amount / players)
			end
		end
		if self.Wave then
			self:NextWave() -- I think that this is the problem
		end
	end
end

local gameWaves = {
    [1] = {
	     ["Easy"] = function()
			       Zombies:New("BasicZombie", 5, 0.7)
			       Zombies:New("Necromancer", 1, 1)
				   self:roundBonus(100, 15)
				end,
				["Medium"] = function()
					Zombies:New("BasicZombie", 7, 0.6)
					self:roundBonus(75, 5)
				end,
				["Hard"] = function()
					Zombies:New("BasicZombie", 10, 0.4)
					self:roundBonus(50, 2)
				end,
				["Nightmare"] = function()
					Zombies:New("BasicZombie", 14, 0.3)
					Zombies:New("SpeedyZombie", 4, 0.5)
					self:roundBonus(25, 27)
				end,
	};
}


function Waves:NextWave()
	if self.Wave < 40 and not gameOver then
		self.Wave += 1
		self.NewWave:FireAllClients(self.Wave);
		self.NewWaveBindable:Fire(self.Wave);
		gameWaves[self.Wave][self.CurrentDifficulty]()
	end
end