Surprisingly, one was first suggested several times in early March, that was the Vulcan greeting – https://www.cnet.com/news/spocks-vulcan-salute-should-replace-handshakes-in-coronavirus-era/ (March 8, 2020). It has gained more traction since first being suggested: https://www.newsweek.com/live-long-prosper-vulcan-salute-spock-handshake-star-trek-coronavirus-leonard-nimoy-1508512 (June 3, 2020; Newsweek article, but referencing a suggestion by a U. K. scientist).
Here are some other suggestions from
L. A. Times (March 13, 2020): https://www.latimes.com/world-nation/story/2020-03-13/coronavirus-namaste-greetings-handshakes-noncontact.
Business Insider: (April 27, 2020): https://www.businessinsider.com/poll-what-handshakes-should-be-replaced-with-2020-4
http://howtodoeasily.com/replace-handshakes-and-hugs-with-one-of-these-greetings/ (may want to avoid at least one of these unless you are in the country where it’s normally used).
There are plenty of suggestions in the above articles to choose from. I expect different people will choose different suggestions. I also believe some people who don’t like change will stick with the handshake as the old go-to way of greeting. From my perspective as long as you are being respectful in the greeting, that’s the important point. I remember when some tipped hats as a way of greeting.