The second thing to do would be to ask why only white makes are applying, and consider what (if anything) might be done to alter that. That might involve some changes at the company, but more likely would require changes in the broader society.
The third thing to do would be to note that essentially no serious advocate of DEI goes beyond the idea that an ideal scenario is on average having work place representation roughly match the distribution in some broader social unit. If you have 0% black people in that broader social unit, nobody but people trying to ridicule DEI would suggest that you need to work towards more black people.
The criteria for what characteristics are considered by DEI efforts in a given context will vary. Gender, religion, "race", language, age ... these are others are all valid things that you might want to try to even up in workplaces to match the broader social context.
