I'd have thought Labour would have realised by now that whoever is their leader, the media will turn on him/her.
My advice (not that he'd ever seek it or take it) would be fight any challenge, be far more decisive (stop seeking bloody consensus all the time.. LEAD!!) and bring fwd the manifesto promises.
e.g Falmouth Dockyard has just lost a refit contract to the David Attenborough ship, gone to a Danish yard, due to rules introduced under Sunak.... Govt says they will revoke these 'rules..... but why the heck, after 2 years, are these rules still in place???