You could put $1000 in tires on the car and it will raise your selling price .... $0 dollars!!!
People expect cars to come with a battery. With tires. With 4 rims. And a running engine.
You could put thousand of dollars worth of maintenance parts into a used car, but that doesn't raise the value of the car. Thats not how the used car market works.
Sell the car as is, let the next owner put new tires on it.
Honestly, it will go to auction, and a very cheap buy here-pay here might buy it and put on 4 used tires if they are that bad.
When I was growing up, I had a used tire dealer that ANY tire, mounted and balanced, was $20. Or a complete set for $70. It was an economical way for my broke self to have good tires on my car.