My engine has cylinder scoring after 9 years, what should I do?

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I just bought a second-hand car and after driving it for less than 1000 kilometers, it consumed 2.5 liters of engine oil (it's a 5-cylinder car registered in 2014). I'm not sure if any of you experience this oil consumption. Should I switch the engine oil from Shell 0W-40? What should I do, any advice for a budget-friendly solution?

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The engine warning light is on for my 2019 car, and the diagnostic says the catalytic converter is aging. What should I do? Do I need to replace it with a new one?

How often should the timing belt be replaced? My car is over 9 years old with 81,000 kilometers on it. Do I need to replace the timing belt? Thanks to all the fellow car enthusiasts.

My engine has cylinder scoring after 9 years, what should I do?