Sell it or give it away
Ask around to see if any friends or family members want the couch. If there are no takers, put an ad on Freecycle, Craigslist, Facebook Marketplace, or Nextdoor letting people know that it’s for sale, or that you’re giving it away. Be sure to specify that they would be responsible for moving it out of your house and transporting it themselves.
Though it may be tempting to put the couch on the curb with a “free” sign, check your city’s rules before going through the effort of moving it outside. In some places, there are designated days for putting stuff on the curb to give away. In others, it’s never OK.