Thanks for clarifying the flu details. As for lockdowns- hindsight is 20/20, but I would do the following-
Issue public health advisory encouraging people to eat healthier, exercise, and possibly even offer subsidies on healthy groceries and vitamins. Vitamin D deficiency is highly correlated to negative outcomes with covid infection. To this day, our federal health organizations haven't even issued statements encouraging people to eat healthier or even do something simple and easy like address vitamin D deficiency. The messaging has been negligent at best.
I would not engage in a fear campaign, and lock people inside. Most spread was occuring between family members confining themselves inside, and stress wreaks havoc on your immune system. We've been subjected to fear induced mass psychosis for the past two years, and as a result have acquired a learned helplessness when it comes to our personal health.
I would also take steps to address to hospital staffing and capacity issues. In the USA, hospitals always run at near capacity, for financial reasons. Instead of refusing to upset that delicate balance game they play, incentives should have been put into to place to bolster staffing so that hospitals wouldn't be overwhelmed. Simply not using hospitals had the effect of killing many more people that were now missing early health screenings.
I would have also liked to see only the most vulnerable be locked down, and only on a volunteer basis. A western, non authoritarian government, has no way to truly implement lockdowns effectively. Partial lockdowns have no benefits, since they didn't actually stop the spread of anything. Instead they caused irreparable harm where they were implemented with very little benefit. Basically security theater. I understand the original intentions, but the prolonged lockdowns, justified by poor metrics of "success" quickly became a political response instead of a scientific response.
Lastly, outpatient clinical attempts at treating covid with repurposed existing drugs should have been prioritized. Trump's warp speed and prep act created insane incentives to actively hamper any attempts to treat covid except pharma approved methods. This whole response feels like the AIDS response all over again, except with more media coverage, widespread corruption, and money at play.