How would one keep an object afloat at a certain Y position?

game:GetService("RunService").Stepped:Connect(function()
    script.Parent.BodyPosition.Position = Vector3.new(script.Parent.Position.X, 92.125, script.Parent.Position.Z)
    
end)

I feel like this isn't an optimal way of keeping something at a certain Y coordinate. I have no idea how to work the "Body" group of objects, can I get some help?

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In the screenshot provided, the boat floats using the script shown above, I feel like there definitely is a better and more efficient way of doing it than this, since I feel like this will lag the server.