How do I detect if the player's mouse is hovering upwards to the sky

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I am creating a glider and it works but i want to implement physics into the system and one of the features is to make the player slowly fall downwards and i need to make sure the player doesnt fly upwards so how do i detect if the players mouse is hovering upwards?
Here is the main handler:

while Flying do
    wait()
    NewVelocity.Velocity = Mouse.Hit.lookVector*60
    local MousePosition = Mouse.Hit.p
    Character.HumanoidRootPart.CFrame = CFrame.new(Character.HumanoidRootPart.Position,MousePosition)
    local rotatedCFrame = CFrame.Angles(math.rad(-90), 0, 0)
    Character.HumanoidRootPart.CFrame = Character.HumanoidRootPart.CFrame:ToWorldSpace(rotatedCFrame)
end