How would I make this Wall Jump/Double Jump script mobile compatible?

I want to make it to where players on mobile can simply tap their jump button twice to double jump, but I don't know how to do that.

wait(2)

local Players = game:GetService("Players")
local UserInputService = game:GetService("UserInputService")
local Player = Players.LocalPlayer
local Character = Player.Character or Player.CharacterAdded:Wait()
local Humanoid = Character:FindFirstChildOfClass('Humanoid')
local Root = Character.PrimaryPart
local root = Character.HumanoidRootPart
local yaxis = 0
local o = 0
local Db = true
local CanDouble = true
local LatestPart = nil
local mouse = Player:GetMouse()
local wallJumpTopAnimTrack = Humanoid:LoadAnimation(script.WallJumpTopAnim)
local wallJumpAnimTrack = Humanoid:LoadAnimation(script.WallJumpAnim)
local doubleJumpAnimTrack = Humanoid:LoadAnimation(script.DoubleJump)
local landAnimTrack = Humanoid:LoadAnimation(script.LandAnim)
landAnimTrack.Priority = Enum.AnimationPriority.Action
local doublecd = true
local FallEffect = false

UserInputService.InputBegan:Connect(function(input, gameProcessed)
if not gameProcessed and input.KeyCode == Enum.KeyCode.Space and Humanoid:GetState() == Enum.HumanoidStateType.Freefall and Db then
	
	local ray = Ray.new(Root.Position, Root.CFrame.lookVector*2.5)
	local hit = game.Workspace:FindPartOnRay(ray, Character)
	
	if hit then
		if hit:IsA("BasePart") and hit.CanCollide == true then

		spawn(function()
		Db = false
		wait(0)
		Db = true
		end)
		if (hit.Position.Y + (hit.Size.Y / 2)) - Root.Position.Y <= 10 then
			wallJumpTopAnimTrack:Play()
			Character.Humanoid.AutoRotate = false
			Root.Anchored = true
			wait(0.2)
			FallEffect = true
			Root.Anchored = false
			Character.Humanoid.AutoRotate = true
			Root.Velocity = Vector3.new(0,75,0) -- was 0,75,0
			return
		end
		
		if LatestPart ~= hit then
		wallJumpAnimTrack:Play()
		Character.Humanoid.AutoRotate = true
		Root.Anchored = true
		wait(0.15) -- was .15
		script.Remotes.Walljump:FireServer()
		Root.Anchored = false
		FallEffect = true
		Character.Humanoid.AutoRotate = true  --was 45 v           --65
		Root.Velocity = Root.CFrame.lookVector * -57 + Vector3.new(0,113,0)
		end
		
		end
		
	else
		if Humanoid.Health < 35 then return end
		if not CanDouble then return end
		if not doublecd then return end
		doublecd = false
		spawn(function()
			wait(0)
			doublecd = true
		end)
		CanDouble = false
		Root.Velocity = Vector3.new(0,65,0)
		doubleJumpAnimTrack:Play()
		FallEffect = true
		spawn(function()
			doubleJumpAnimTrack.Stopped:Wait()
			if Db == false then
			Db = true
			landAnimTrack:Play()
			end
		end)
	end
		
end
end)



mouse.KeyDown:connect(function(key) 
	if key == " " then
		
		spawn(function()
			repeat wait() until Humanoid.FloorMaterial ~= Enum.Material.Air
			LatestPart = nil
			CanDouble = true
		end)
		
	end
end)

repeat wait() until Character

function fallcheck()
  
if root.Position.Y > 40 then
 --game.ReplicatedStorage.Events.FallDamage:FireServer(o)
 end
 o = root.Position.Y
end

Humanoid.StateChanged:connect(function(Oldstate, Newstate)
if Newstate == Enum.HumanoidStateType.Landed then
local NewYAxis = root.Position.Y
--print(yaxis - NewYAxis)

if FallEffect == true or yaxis - NewYAxis >= 10 then
	Humanoid.WalkSpeed = 0
	Humanoid.JumpPower = 0
	      fallcheck()
      local a = Humanoid:LoadAnimation(script.LandAnim)
      a:Play(0.15, 1, 1)
	local Effect = game.ReplicatedStorage.FallPart:Clone()
	local Sound = game.ReplicatedStorage.Sounds.Land:Clone()
	Effect.Parent = workspace
	Effect.CFrame = root.CFrame * CFrame.new(0,-2.5,0)
	Effect.Smoke:Emit(50)
	Sound.Parent = workspace
	Sound:Play()
	game.Debris:AddItem(Sound, 4)
	game.Debris:AddItem(Effect, 4)
	wait(.05)
	Effect.Smoke.Enabled = false
	wait(.2)
	Humanoid.JumpPower = 50
	Humanoid.WalkSpeed = 16
	FallEffect = false
	end

end
if Newstate == Enum.HumanoidStateType.Freefall then
	yaxis = root.Position.Y
end
end)

Instead of using mouse.KeyDown, use ContextActionService:BindAction() with Enum.PlayerActions.CharacterJump.

local CAS = game:GetService("ContextActionService")

CAS:BindAction("WallJump", function (name, state, input)
    if  Humanoid:GetState() == Enum.HumanoidStateType.Freefall and Db then

    local ray = Ray.new(Root.Position, Root.CFrame.lookVector*2.5)
    local hit = game.Workspace:FindPartOnRay(ray, Character)

    if hit then
        if hit:IsA("BasePart") and hit.CanCollide == true then

        spawn(function()
        Db = false
        wait(0)
        Db = true
        end)
        if (hit.Position.Y + (hit.Size.Y / 2)) - Root.Position.Y <= 10 then
            wallJumpTopAnimTrack:Play()
            Character.Humanoid.AutoRotate = false
            Root.Anchored = true
            wait(0.2)
            FallEffect = true
            Root.Anchored = false
            Character.Humanoid.AutoRotate = true
            Root.Velocity = Vector3.new(0,75,0) -- was 0,75,0
            return
        end

        if LatestPart ~= hit then
        wallJumpAnimTrack:Play()
        Character.Humanoid.AutoRotate = true
        Root.Anchored = true
        wait(0.15) -- was .15
        script.Remotes.Walljump:FireServer()
        Root.Anchored = false
        FallEffect = true
        Character.Humanoid.AutoRotate = true  --was 45 v           --65
        Root.Velocity = Root.CFrame.lookVector * -57 + Vector3.new(0,113,0)
        end

        end

    else
        if Humanoid.Health < 35 then return end
        if not CanDouble then return end
        if not doublecd then return end
        doublecd = false
        spawn(function()
            wait(0)
            doublecd = true
        end)
        CanDouble = false
        Root.Velocity = Vector3.new(0,65,0)
        doubleJumpAnimTrack:Play()
        FallEffect = true
        spawn(function()
            doubleJumpAnimTrack.Stopped:Wait()
            if Db == false then
            Db = true
            landAnimTrack:Play()
            end
        end)
    end

end

    return Enum.ContextActionResult.Pass
end, false, Enum.PlayerActions.CharacterJump)

This should handle all methods of jumping on all platforms. Edit: Replace the UIS.InputBegan handler with this