There's no fixing that mess. You need to replace it. Maybe go with something like this.
https://www.amazon.com/FLYPIG-Kart-Steering-Shaft-110cc/dp/B01N4D0O2A?th=1
Quick, easy, and cheap would be this:
https://www.amazon.com/FLYPIG-Kart-Steering-Shaft-110cc/dp/B01N4D0O2A/ref=sr_1_13?keywords=Go+Kart+Steering+Parts&qid=1646100111&sr=8-13