When to stop relisting
After 4 repost cycles and 2 price drops without a sale, the problem is not visibility. It is demand, positioning, or condition. At that point, consider:
Search for similar items. If yours is priced above the median and has not sold after 4 cycles, the market is telling you something.
A model photo gets more clicks than a flat lay. If your main photo is not generating clicks, no amount of relisting will fix the ranking.
Some items simply do not sell on Vinted. Consider cross-listing on Depop or eBay, or bundling with a better-selling item.