I think I've mentioned that the concept of "belonging" is far more powerful than "joining" (think about that when you write your 47th "join us!" social media job post...), but the HBR goes deeper, defining the value of having people feel like they belong to the company. (Note the juxtaposition with the white paper above where isolation and loneliness are going to be a real problem).

It feels reasonable to me that in a time of virtual/remote everything, the thing that will help bring people together and build connection and increase productivity is shared learning. What we learn together is what keeps us together. That holiday zoom class where everyone learned to make gnocchi in their own kitchens was the highlight of your Q4? Keep that in mind and start supporting shared learning experiences at work as a means of developing culture.