@danish@openstreetmap in general edit the existing one, all elements in OSM are versioned and it is considered best practice to maintain the history of objects.
@foxy@danish@openstreetmap you need to differentiate between reusing existing nodes for other purposes (as in your example), which irl works against preserving history, and using an existing element for a new or different facility in the same place (there is some grey area there obviously).
@danish@openstreetmap Edit the existing one to preserve object history. Good practice ist to change shop=something to disused:shop=something. This way the object can be re-tagged again as shop=somethingnew if it re-opens. If it just re-opens just skip the disused step.
Please don't delete and recreate if you can. Keeping the history of points is useful, if you delete a point you will delete its history. Wiki article with more details: https://wiki.openstreetmap.org/wiki/Keep_the_history