PetMarket.net can have many buyers.. especially from pet-food/pet-selling business.
I can appraise it at $1000 to $1500
and it is get quite a good backlinks then $2000
It's a good TLD name and a profitable industry. @April004 and @jim h have provided good quotes.
With everybody spending time at home due to covid, this market is experiencing a surge in sales.
People are also looking for new online businesses opportunities.
I would suggest that you try and sell it now!