Value is not a valid member of folder?

local replicatedStorage = game:GetService("ReplicatedStorage")
local remoteData = game:GetService("ServerStorage"):WaitForChild("RemoteData")

local cooldown = 1

replicatedStorage.Remotes.Lift.OnServerEvent:Connect(function(player)
	
	if not remoteData:FindFirstChild(player.Name) then return "NoFolder" end
	
	local debounce = remoteData[player.Name]
	
	if not debounce.Value then
		
		debounce.Value = true
		
		player.leaderstats.Strength.value = player.leaderstats.Strength.Value + 25 * (player.leaderstats.Rebirths.Value + 1)
		
		wait(cooldown)
		
		debounce.Value = false
		
	end

end)

When I run the script it keeps saying value isnt a valid member of folder can somebody help?

I believe your problem is that on line 16, the first "Strength.value" is not capitalized to "Strength.Value", meaning you aren't correctly indexing the property of Strength

Below is the Revised Code

local replicatedStorage = game:GetService("ReplicatedStorage")
local remoteData = game:GetService("ServerStorage"):WaitForChild("RemoteData")
local cooldown = 1

replicatedStorage.Remotes.Lift.OnServerEvent:Connect(function(player)
	if not remoteData:FindFirstChild(player.Name) then return "NoFolder" end
	local debounce = remoteData[player.Name]
	if not debounce.Value then
		debounce.Value = true
		player.leaderstats.Strength.Value = player.leaderstats.Strength.Value + 25 * (player.leaderstats.Rebirths.Value + 1)
		wait(cooldown)
		debounce.Value = false
	end
end)