another newbie question

i make money from using p bns for my own rankings, however I have 100's of da 30+ .com's

Is there a place for me to sell these quickly even for 20 bucks each? Like list one at a time or 5 at a time, or am I really better of focusing on finding niche ways to find them to rank ninche products or something

from reading the questions on here it appears any fool with scrapebox can find da 30+ domains

Costs $9 to list them at flippa, so you'll need to add that to the final price. If they're DA 30 you should sell them easily for 20 to 25 bucks.