It all starts with the number of bids on the domain. If you register domains easily with zero competition, there’s a high probability the domains aren’t very good.
If, on the contrary, every domain is a fight and you battle until the winning end, you are on the right track. Here’s a random screenshot of my auctions on GoDaddy. As you can see, the competition is fierce on almost all domains. That means you’re on the right path 😉
Basic filter
Ahrefs DR>5
CF > 10
TF >3
Domains>50