Need help on value not updating ingame

Help and Feedback Scripting Support
1

I’m trying to update a knockback value through a gui (the knockback value is stored in a numbervalue), but the value used when knockback is applied isn’t updating along with the gui and actual numbervalue being changed. (it is in a normal script, not a local script so using RunService.RenderStepped won’t work)
if it helps, here’s the script:

    -- /* Roblox Services / --
local Debris = game:GetService("Debris")
local RunService = game:GetService("RunService")
local damage = script.Parent.Parent.Damage.Value
local knockback = script.Parent.Parent.Knockback.Value
-- / Variables / --
local func = script.Parent.punched
local maxpower = 15 --/this?/--

-- / Event Listeners / --
func.OnServerInvoke = function(plr, hum, dmg, tor)
    -- / Sound plays and added to debris
    local sound= Instance.new("Sound")
    sound.SoundId= "rbxassetid://1023128237"
    Debris:AddItem(sound, 5) 
    sound.Parent = tor
    sound.RollOffMinDistance = 1000
    sound:Play()

    -- /* Humanoid take damage / --
    hum.Health = hum.Health - damage

    -- / Knockback */ --
    hum.Jump = true
    local BodyVelocity = Instance.new("BodyVelocity", hum.Parent.HumanoidRootPart)
    Debris:AddItem(BodyVelocity, 2)
    local cfr = script.Parent.Parent.Parent.HumanoidRootPart.CFrame.LookVector * knockback --/this?/--
    BodyVelocity.P = maxpower
    BodyVelocity.Velocity = cfr
    wait(1) --/this?/--
    BodyVelocity:Destroy()
    hum.Jump=false
end`
2

If you are updating a value through a GUI just note it will not replicate this value on the server if done from the client

3

When you were defining “knockback” and “damage” you don’t want to include the .Value, only include that when changing the value.

4

Also for your knowledge, You can use this for run service on the server

RunService.Heartbeat:Connect(function(step)
          -- Stuff here
end)