I think that the LP needs to start again and relaunch. The 'old guard' has to go, and that means McDonnell, Starmer, Thornberry, Lavery, and others. It's unfortunate for some of them, but the trend for blaming a cabinet from 10+ years ago for Tory failure will haunt them if they keep anyone who isn't new, and the media have ensured that links with Corbyn are the death knell for anyone in his inner circle.
It will be 5 years until we get another chance, so there is time for new people to get experience and get their faces known before then.
I think that Jess Phillips would be really good, and I've heard that David Lammy might be considering standing for leader -he would be good too, but there is scope for someone much less well-known to step up if they do it quickly.
Either way, they need someone who is a lot more media savvy than Corbyn, and they need a Comms Director who can take on Cummings and his ilk. It's a shame, as this sort of thing is counter to the old grassroots Labour way, but I think that way has had its day, and fire has to be fought with fire.