This is good news. We just returned from two weeks in Switzerland. Nearly cancelled our trip due to Covid (and these recommendations) but are so glad we didn't. It was the trip of a lifetime and the crowds were minimal. We never felt unsafe. Talking with other travelers we met from the US, we agreed that CDC level 4 is no different than most places in the US! If you're vaccinated, which is a requirement of entry, the risk is low if you're healthy (or so we are told, right?). Switzerland requires vaccination proof for museums and indoor dining, masking on all public transport and indoor areas. Our neighbors also just returned from Europe (Switzerland, Austria, Germany) and agreed. We brought video monitored self test kits to show negative for COVID for our return to the US. There was some added stress about testing negative. I had purchased travel insurance just in case we were delayed. We're ready to go back anytime!