Ebay's algorithm is a closely guarded secret, but I've learned (and been told by others wiser than me) of things that can be done to improve sales.

Adding fresh listings every day for a week or so is good, they get pushed up in search and then people click the "view other listings" to see what else you've got. Closing and re-listing slow sellers can sometimes trick the system into doing the same, or editing existing listings by dropping the price a little or using one of the promotional tools eBay has.

It's worth reviewing eBay seller requirements to see if there are any extra boxes you can tick that can help with search placement - longer return periods or free returns, free shipping, faster delivery options, stuff like that.

I use repricing software, but that's mostly because I've got listings for items I always keep in stock in a very competitive category, so it's not a thing that works for everyone.

But overall it's just a case of continually experimenting to see what works best in your category and against your competitors, and keeping up-to-date with eBay policy announcements.

Good luck ! 😀