Covid will mutate into a much more virulent strain.  Face masks and hand washing will no longer help.  Oddly enough, anyone who had been afflicted with a very long term case of Lyme disease is completely immune.  Quickly the worlds human population decreases to .000001% of what it is now.  In just a few short years the planet heals itself, I become king, and humanity enters a new era of peace and enlightenment in our new Eden.