The end of Grey's

So I have no idea when Grey's will end obviously but let's say they end season 21 and do season 22 and then announce that season 22 will be the last season what would be the perfect ending to show. Would there be any characters from the past 21 season who you would bring back for a cameo Alex,Izzy, and/or Cristina maybe? Would the show end with Zola starting her internship at Grey Sloan memorial? Does Meredith find another great love? Would you bring back any of the characters who have died on the show?