I think council tax reform is long overdue - it is a very regressive tax, a was always meant to be temporary - even if the aim is revenue neutral rather than raising more money.
Ideally, I’d like to see it abolished and replaced with something better, but in the interim, increasing the number of council tax bands to at least 12, alongside a revaluation of properties for tax purposes, with a commitment to regular revaluations would produce a more equitable system.
There is also scope for a land value tax on derelict and underused land and buildings to sit alongside those changes, to discourage both land banking and owners allowing property to sit empty/fall to pieces while the land value continues to increase.