[xg15]

This probably would have been good advice in late summer or early fall when contact tracing was still possible.

However now there seem to be so many diffuse infection events and undetected chains that the question is more about how to regain control. I'm not sure how this is achievable without contact restrictions.

[m_mueller]

One way to regain control is to mass produce cheap rapid test kits, do a couple of mass testing events where significant percentage of population is tested to identify all clusters, isolate and trace from there. See Slovakia as an example.