I used a sod plugger like this back in the day. Take plugs from your existing yard and fill the holes back with topsoil. Then make holes with the same tool to plant the plugs in the bare area. It works but takes a LONG time to fill in gaps as noted above. Think about Uncle Bud's backyard in Urban Cowboy. It didn't change much from beginning to end LOL.
I am not the Six Million Dollar Man, but I might need that surgery. "We have the technology, we can rebuild him!"