I’d refurbish the closed down department store in our dying town. It would be an emporium full of goods you actually needed. Quality items of clothing, the sort of place you’d go to buy a funeral coat, a dress for a wedding, a good pair of knickers or a pair of nice trousers.
There would be a gift section of thoughtfully curated items displayed with grandeur and glamour.
Quality furniture you would buy that would last a life time.
The sales staff would remember you from when you bought your expensive sofa in your 20’s when you pop back for a recover in in your 40’s
It would have a gorgeous haberdashery with staff in hand who knew what they were talking about. There would be a repair section where you could get your expensive clothes maintained.
The staff would smile, care about the products, know where and how they were made. No such thing as automated tills.
All things made in Britain. Food in the cafe from British farms, carpets of British wool.
Clean toilets, bright and cheerful decor. Amazing Christmas decorations with wreath workshops and Christmas trees to rent.