Help with an "Amplitude" System

I’m making a perlin noise system and i want the higher parts to be a different colour but i have it so it’s pretty rare which i don’t want, i’d like it to be way more common.

What i want:
Screen Shot 2024-01-14 at 3.29.39 AM

Code:

	f.Parent = game.Workspace
	local TileSize = math.random(1,50)
	local Smoothness= math.random(2,15)
	local Size = math.random(50,80)
	local Frequency = math.random(10,60)
	local Altitude = math.random(100, 250) -- Culprit

	local Colours = 
		{
			Color3.new(math.random(0,255),math.random(0,255),math.random(0,255)),
			Color3.new(math.random(0,255),math.random(0,255),math.random(0,255))
		}

	for	x = 1, Size do
		for z = 1, Size do
			local Height = (math.noise(x / Smoothness, z / Smoothness) + 5) * Frequency
			local p = Instance.new("Part")
			p.Anchored = true
			p.Parent = game.Workspace.Perlin
			p.Size = Vector3.new(TileSize,Height,TileSize)
			p.Position = Vector3.new(z * TileSize, Height, x * TileSize)
			if Height <= Altitude then
				p.Color = Colours[1]
				print(Height .. " is lower than " .. Altitude)
			else
				p.Color = Colours[2]
				print(Height .. " is higher than" .. Altitude)
			end
		end
	end

end)