Diagnose first: which traffic is actually gone, and to where
Before deciding on a recovery program, build a clear picture of what changed. In Search Console, segment your top queries into three buckets: queries where impressions held but clicks fell (AI Overview is showing and absorbing clicks), queries where impressions also fell (you were de-ranked, not just AIO-displaced), and queries where AIO is shown but you are cited inside it (potentially still receiving qualified traffic).
The right recovery move is different for each bucket. Treating an AIO-displaced query the same as a de-ranked query wastes effort. Spend one week on diagnosis before spending six months on the wrong fix.