This domain has been an active dev sandbox for almost 20 years, and still is. It's also been the domain for my personal and business email that entire time.

That said, I'm getting to a point where I'm about ready to let go... but your offer will need to make it worth the daunting and protracted effort of updating two decades' worth of accumlated contacts, registrations, etc.

Research comps, then make a fair and reasonable offer.