I believe that a player can be an effective leader by leading by example. If a player is able to set a tone for practices and off-season workouts and be consistent all the way through teammates will soon follow along. Once everyone gets on the same page that is when great success will come.
Right now during the stay-at-home players can be leaders by being reliable and communicating with their teammates. Reaching out to your teammates and seeing what they did to better their game that day. I know coach Massey has sent workout challenges out to all the players, so I would make sure that at the end of each week your name shows up in the completion of the challenge. This will show your teammates that they can rely on you to continue to work. Always remember what you do when nobody is watching is what separates a champion from everyone else.