When one says "luxury" products, then these are products which are purchased by people to whom inflation just does not matter. Luxury products are for people who are quite rich and such people do not get affected by inflation, rising costs, etc.
If incase your luxury products are not selling in a brick and mortar store, then it is most probably due to the incorrect location of your store.
Is your store located where "luxury" level rich people frequent (hang out) ?
If not, no type of promotion would result in any improvement in sales
For a brick and mortar luxury store, the most important aspect is it's physical location.