You misunderstand seasonal (winter) flu viruses. They arrive and have no or mild impact on general population, but can be deadly for those with underlying (respiratory) health issues and then go away. A natural rise and fall. There is not much you can do to stop them, only mitigate the symptoms.
Crashing the economy (following Deep State/Imperial College London) “expert advice” and banning children from seeing their parents, attending graves and funerals etc, rather than focusing on the vulnerable (Adult Social Care) has made the cure worse than the disease, as many other mental/medical health problems grow.