Repairing worn-out paint?

Hello, I have a question about a 10 year old Astra whose paint is extremely worn out (stratter & glossy) . Some of you will now think: “What does this one want? An Astra is not a classic car” I also give that one absolutely right! But the paint condition of the Astra is really extremely bad, which is due to “inappropriate” use on the field and flea. Since the car is now to be “resocialised” and is on the road again in the city, the paint should be back in Ord What suggestions do you have for the varnish? A certain product with which you have had good experience? A paint cleaner or rather a polish? You can no longer do a lot of work with the varnish. Would I be happy if you could help me with your experiences a little bit further! Many greetings Jochen