You could sell it on Facebook/Craigslist/etc.

I've sold two bikes that way. One was actually broken - was a mountain bike that had one of the rear struts broken by a low root I didn't see on some single track. Some lady still paid me like $200 or so for it since she had a friend who could weld it back together and she figured her son would love it since it was a pretty decent bike (I paid $1500 for it new back in the day, sold it cheaply to get it out of my parents garage and recoup a bit). The other bike was functional and I got like $300 for it. It was an old Dicks Sporting Goods MTB that I had converted into an urban explorer bike during the beginning of the pandemic. I eventually ended up buying like 2 other bikes and didn't need it anymore. Some guy off Facebook wanted it since it had a 3x7 and a rear rack for cargo.

Just list it at whatever you think will sell, or go high and let people low-ball you enough until you get a reasonable price. Put the proceeds towards your next bike. 🚴