NumberValue doesn't change. How to make it work?

this is my stamina script. it does somehow work but numbervalue doesnt change so i had to script whole thing in one script (i want to make a dash part a separate script and make stamina gui based on numbervalue). "stamina" variable is a numbervalue. also its localscript if that matters.

local player = game.Players.LocalPlayer
local character = player.Character
local humanoid = player.Character:WaitForChild("Humanoid")

repeat wait() until player.Character

local UIS = game:GetService("UserInputService")

WalkingSpeed = 16
RunningSpeed = 32
JumpingPower = 50
stamina = script.Parent.Stamina.Value
local isRunning = false
local isJumping = false
local canRun = true
local canDash = true
local gui = game.StarterGui.Movement
local text = gui.InfoGui.StaminaText

staminaDrain = 0.05
staminaRegeneration = 0.1

local tapped = false
local dashCooldown = false

humanoid.WalkSpeed = WalkingSpeed
humanoid.JumpPower = JumpingPower

UIS.InputBegan:connect(function(key)
	if key.KeyCode == Enum.KeyCode.LeftShift and humanoid and not isRunning and canRun then
		isRunning = true
		humanoid.WalkSpeed = RunningSpeed
		while isRunning and stamina > 0 do
			text.Text = stamina
			stamina = stamina - 1
			wait(staminaDrain)
		end
		if humanoid then
			humanoid.WalkSpeed = 16
		end
		isRunning = false
	end
end)

UIS.InputEnded:connect(function(key)
	if key.KeyCode == Enum.KeyCode.LeftShift and humanoid then
		isRunning = false		
	end
end)

UIS.InputBegan:Connect(function(key)
	if key.KeyCode == Enum.KeyCode.LeftShift and humanoid and canDash and not dashCooldown then
		if tapped == false then
			tapped = true
			wait (0.25)
			tapped = false
		else
			dashCooldown = true
			character.HumanoidRootPart.Velocity = character.HumanoidRootPart.CFrame.lookVector * (stamina + 100)
			stamina = stamina - 25
			wait(3)
			dashCooldown = false
		end
	end
end)

humanoid.StateChanged:Connect(function(oldState, newState)
	if newState == Enum.HumanoidStateType.Jumping then
		stamina = stamina - 10
	end
end)


while true do
	if not isRunning and stamina < 100 then
		stamina = stamina + 1
		text.Text = stamina
	end
	if stamina >= 25 then
		canRun = true
		canDash = true
		humanoid.JumpPower = JumpingPower
	elseif stamina <= 10 then
		canRun = false
		canDash = false
		isRunning = false
		humanoid.JumpPower = 0
	end
	if stamina >= 10 then
		
	end
	wait(staminaRegeneration)
end

thanks in advance

fixed it. just changed

stamina = script.Parent.Stamina.Value

to

stamina = script.Parent.Stamina

thanks for "help"