The problem has always been that the lockdowns have been too half-hearted and so have dragged on and on and on
There are countries where lockdowns have been near complete, with curfews and no time outdoors at all, just how much less "half-hearted" do you imagine these countries could have done?
The repeated statement that lockdowns are half hearted and there's some "more lockdown" would have achieved more has no evidence behind it at all, strictness of lockdown has no correlation with cases across Europe at all.
Forced isolation has perhaps had a large impact in certain areas of China, but that isn't lockdown.
I would SO much prefer one month of full lockdown for everyone apart from the most essential workers - with a basic income given to everyone - to stop this thing spreading and let it die out
But such a thing would not cause it to die out, it would drive it very low, but it would soon return, it's endemic and likely in many wild animal populations too, And the health effects on everyone would be disastrous, everyone old would never get their fitness back and be at a higher risk of death than if they'd got covid, and a much higher risk if they subsequently caught covid or flu, or indeed anything else.
Lockdowns are disastrous for health, exercising, which for the majority of people requires outdoors unless you're going to deliver everyone a treadmill, can mitigate much of the harm, particularly if you eat less too, deny the exercise and they are just disastrous.