Just let another batch of ancient domains renew. I'm ready to let them go now. Not sure if there's much value (suspect not as most are .info keyword domains, many with some hyphens, though in some OK, high volume spaces).
Ultimately I could just switch off the auto-renew, but figure it may be worth a shot to see if there's any appetite for someone to acquire some of them.
Where do you go to shift old domains? Sedo? Some other marketplace?
GoDaddy was worthless for selling. My good sales prospects always contacted me directly from whois.
Back in the day, I changed my domain admin email to "DomainForSale"@whatever.com or "DomainNOTForSale"@whatever.com --seemed to cut down the nuisance lowball offers and anything coming in on "DomainNOTForSale" was probably a bot, a dumbass, or no english language comprehension(charitable).
Last I looked into this a few years ago, I listed a few that seemed promising - better than a domain with no obvious commercial intent that I sold for $1000 ten years earlier - and got no bites even at a $35 minimum bid. Crickets.
Then I looked through auction results and realized that most domains that get listed go unsold or are genuinely high value. Sports betting domains might get bids.
I think opening up all the new TLDs pulled the rug out from anything but genuinely premium domains with strong commercial intent. If you want $1000 for a domain, they just look for the same word on a .io or a .whatever
I just turned off auto-renew and let them go.
So from this I assume there is little value in an aged domain link for SEO now.