Yeah I think that's the move at this stage sadly...
It might be a good opportunity to get a bit of new topsoil on to level it up and prep for future growth while I'm at it but expectations of lush carpety green growth are firmly in the past for now :(
Seriously though, just water the fuck out of it, and forget about it until next year.
Odds are there aren't any interventionist methods, even less so this time of year so do what you can to wash the iron sulphate away.