"Compensatory approaches" is what the behavioral interventions for autism are. No silver bullet, but it does help, and it's often well worth the effort.

A timely well executed intervention may make the difference between "needs a caretaker" and a mere "struggles in life". But it's not going to negate all of the damage.

Gene therapies I have little hope for. Maybe something there may help. But the impression I get is that it's less of a "fix biochemical deficits" issue, and more of an "unwire and rewire existing neural circuits" issue. We have no fucking clue on how to do that. And to sidestep that, you'd have to intervene early - maybe as early as "remove genetic predispositions in an embryo".