Not an easy thing to achieve but I think variety and accessibility are key. So try and encourage a variety of retail outlets not just more cafes and pharmacies. This would probably require some form of reduction in overheads to enable smaller niche shops to be economically viable. Ensure there are safe and secure places for bicycles to be temporarily stored, have some dedicated (maybe free) parking spaces for electric cars to encourage less petrol vehicles. Try and keep future developments as close to the centre as possible or ensure there is some form of public transport (maybe even a weekend shuttle bus from higher density developments.
Ensure it is kept clean and safe as possible and pleasant looking e.g. flower boxes and/or art installations. Try and use empty locations for pop up events such as art shows, mini craft fairs etc