Issues With Random JumpPower/WalkSpeed booster?

I recently designed a new feature for my game, which randomly chooses a random property within the humanoid (JumpPower or walkspeed) to increase by a random amount. However, it doesn’t appear to be working. There are no errors, it just keeps the text label’s text at nil. I have no idea why this is happening. I feel like it may be linked to my round system, so I’ve provided part of the round system script, where the event related to this local script is being fired.

	if inter.Value == 0 then
			game.ReplicatedStorage.IsIntermission.Value = false

			TeleportPlayers()
			TagAllPlayers("Alive")
			game.ServerStorage.DisasterEvent:Fire(numberOfDisasters, true)
			game.ReplicatedStorage.StartPowerups:FireAllClients(true)

			for i = 120, 0, -1 do
				roundtime.Value = i
				game.ServerStorage.PlayerEliminated.Event:Connect(function(plr)
					collectionService:RemoveTag(plr, "Alive")
					collectionService:AddTag(plr, "Dead")
					plr.CRW.Value = false
				end)
				wait(1)
			end
			if roundtime.Value == 0 then
				game.ReplicatedStorage.StartPowerups:FireAllClients(false)

				TeleportPlayersBackToLobby()
				wait(1)

				AwardPlayers()	
				wait(1)
				CleanUp()

			end
		end

The actual local script code itself is this:


local Player = game.Players.LocalPlayer
local Character = Player.Character or Player.CharacterAdded:Wait()
local Humanoid = Character:WaitForChild("Humanoid")
local CollectionService = game:GetService("CollectionService")
local Choices = {"R", "J"}
local ShouldStart = false
game.ReplicatedStorage.StartPowerups.OnClientEvent:Connect(function(bool)
	ShouldStart = bool
	if bool then
		local Valid = true
		wait(2)
		for i, v in pairs(CollectionService:GetTagged("Dead")) do
			if v == Player then
				Valid = false

			end
		end
		while wait(10) do
			if Valid then
				if ShouldStart then
					local ShouldAdd = math.random(1, 7)
					local rndm = Choices[math.random(1,#Choices)]
					if rndm == "R" then
						script.Parent.Image.TextLabel.Text = "+"..tostring(ShouldAdd).." Speed"
						Humanoid.WalkSpeed = 16 + ShouldAdd
					else
						script.Parent.Image.TextLabel.Text = "+"..tostring(ShouldAdd).." Jump Power"
						Humanoid.JumpPower = 50 + ShouldAdd



					end
				else
					break
				end
		
			else
				print("Player not valid")
				script.Parent.Image.TextLabel.Text = nil

			end
		end

	else
		script.Parent.Image.TextLabel.Text = nil

		Humanoid.WalkSpeed = 16
		Humanoid.JumpPower = 50
	end


end)

Help very much appreciated

Thanks in advance!