like I said it needs parts replaced.
new front hubs
new spindle bushings
new tie rods
new rear axle
new rear bearings
it is almost at the point where finding a cheap used chassis might be a better option
Sure you can sell it for a few bucks , maybe very few , but you have the starting point to build on and learn how and what each component does . Just starting out , it looks like a good working piece . Best thing to do is decide your budget , then compare prices for rebuilding that one to race condition against selling it and finding a cheaper race ready kart . Whatever you decide , good luck , and welcome to kart racing .