I have never understood the logic of the British, throwing a car out because it is cheaper to buy another used car, than to change the belts, as an example.
If I had had a car for 10 years, I would give it a service if it needed, provided I like the car.
To sell it, because it's value is less than the repair cost, is not clever, because you are likely to pick another car up with other issues of some sort.
Sometimes it is better to stick with the devil you know, I think!
On the positive side, your driving is reduced, the time to do the service is increased, and limited funds?? what is new?. I have been on limited funds since I was born. The only thing you have to do is use less than what is available, and make a sport out of that!
Once retired you should be lucky to have a hobby and a quiet space in the garage! Otherwise you would need hearing protection and skills in knitting and baking.
Much nicer in the shed!
Enjoy your retirement!