My textLabel script that shows the Level is not working, help?

The script is about a textLabel that shows the level of the local player without it ("it" is the Level) being an IntValue on the Leaderboard.

local textLabel = script.Parent
local Level = ("Level").Name
local XP = ("XP").Name
local Humanoid = script.Parent.Parent.Parent.Parent.Parent.Human

Level.Value = 0
XP.Value = 0

function KillForXP()
XP.Value = XP.Value + 100
wait(0.1)
script:remove()
end
Humanoid.Died:connect(KillForXP)

function XPforLevel
Level.Value = Level.Value + 1 -- here the first Level is red underlined :(, help?
if Level.Value + 1 then 
	XP.Value = 0
end
wait(0.1)
script:remove
end
XP.Value = 1000:connect(XPforLevel)

textLabel.Text = Level.Value -- the textLabel ( Parent )

Most of the problems are from syntax errors. For example, you forgot to add parentheses to the function at line 16. Read the errors that the "red lines" say and most of this should be fixed.

There are lots of syntax errors, stated by previous answers and comments. There is also a lot of deprecated code in your script. Big no no. Let me fix it up. Assuming your XP and Level values are in a leaderstats:

local plr = game:GetService('Players').LocalPlayer
local char = plr.Character or plr.CharacterAdded:Wait()
local humanoid = char.Humanoid -- idk why you even put 50 script.Parent 
local label = script.Parent
local leaderstats = plr:WaitForChild"leaderstats"


local xp = leaderstats:WaitForChild"XP"
local lvl = leaderstats:WaitForChild"Level"

function killForXP()
    xp.Value = xp.Value + 100
    wait(.1)
    script:Destroy() -- :Destroy() not :remove()
end

humanoid.Died:Connect(killForXP) -- :Connect not :connect

function xpForLevel() -- forgot the brackets
    lvl.Value = lvl.Value + 1
    xp.Value = 0
    
    wait(.1)
    script:Destroy()
end

xp.Changed:Connect(xpForLevel)

lvl.Changed:Connect(function() 
    label.Text = "Level: "..lvl.Value
end)