Whilst Milliband doubtless feels he has tried for high office and isn't interested Starmer needs to promote him in the shadow cabinet for his obvious abilities to assist Starmer in times like today. Furthermore if Labour can present a talented cabinet in the face of a Tory shambles it makes them a more electable party. Then bear in mind that Parliamentary competence faces off against shouty buffoonery the Tories damage themselves.
Starmer is a lawyer and intellectual, Boris is a chancer ex-journalist and we can all see the difference. He should be able to pick that apart with ease but they have to do it right.
Let's face it, the Tories aren't where they are because they are clever or have better ideas. They chanced their policies to get into power but now they are actually having to do something they are failing.
This is where Starmer can capitalise, he just needs to regain Labour's credibility and remove the protest movement image. No-one will vote for a protest movement but with what's going on today they will vote for something that is both credible and sensible.