How Do You Identify Profitable Products to Sell on eBay?

I've been looking over eBay, but it's difficult to determine which items sell regularly. How can you choose products with strong profit potential if you sell on a regular basis?

Sharing a ebay strategy i saw work for others:
Niche vertical, something with volume and ~$100+ AOV-
scrape for listings that lack detail, which are often techno-illiterate. Usually they have many items priced > 50% under market-
learn MPNs that sell well, buy mislisted and underpriced items
This works great for trade equipment