Obviously the political situation and what’s feasible is different, but I hope restrictions on group sizes and a small number of activities is not infeasible. They are not “lockdown”, they are the way to avoid lockdown.
Again there is no political possibility of a future strict lockdown in the US. So for better or worse it has already been avoided.
There are some obvious ones, like: no new cases in the city/county reported in 14 days.
For some reason, it seems people thought this would take a month or two, and then everything will be back to normal. But it wouldn't. Two months is a ramp-up period, a default if you do nothing. "Flattening the curve" measures were always going to extend the partial lockdowns until late this year. We knew that in March.
Obviously there is not going to be a total lockdown in the the US no matter what happens. Regardless of the potential benefits, that option isn't even remotely politically feasible. People simply won't comply, and there aren't enough police to enforce it.