I'm not bothered about shopping in shops, as I rarely did it pre-Covid. I don't drive, and it is difficult to get to out of town 'centres', and in any case I think we should be cracking down on the number of cars in town centres to keep the air clean.
I would like to see specialist shops on high streets, with things like household items delivered with groceries. Clothes shopping as a leisure activity is showing signs of becoming unfashionable, which I think is a good thing. If we go back to buying good quality things less often, we wouldn't need convenient clothes shops - we could make occasional trips to the ones we like, as people used to do.
High streets could become community hubs, where people could go for entertainment, to socialise, learn, meet up, eat, play, whatever, with far less emphasis on consumerism. That would help to cut loneliness, cut emissions (if people aren't carrying lots of 'stuff' they could walk to town or take a bus) and stop high streets from decaying into grotty areas with nothing but charity shops, nail bars and boarded up windows.
With a positive attitude and a bit of imagination, we could change the demise of the high street from a problem to an opportunity .