Autism isn’t curable because it’s not a disease. It’s a difference in brain development. You can no more cure it than you can cure ADHD or being transgender.
What you can do is provide a child support. Autism is a spectrum, and some children will need more support than others. Early-childhood behavioural and communication therapies can make a massive difference in the long-term prognosis for a child with autism. Different educational approaches can also help quite a bit. This isn’t going to solve the problem for every single child, but the outlook for people with autism is significantly better than it was in the 80s.
I sincerely hope life doesn’t force you to become the caretaker of an autistic child.
I absolutely refuse to put another human being on a dying planet, so no need to worry about that. Regardless, if I do somehow end up with a child, I’m fully on-board to support them no matter how they turn out.