Howdy from South Carolina and welcome to the forum.
There are so many ways to look at your situation, but before answering, I'd first ask if the gun "speaks to you". When you hold it, do you think "this thing is freakin cool and I'd like to try shooting it"? If so, I'd recommend keeping it and getting instruction to use it safely.
Revolvers are a good beginners firearm and a 686 is an excellent all-purpose platform. Every person I take shooting, shoots it well from the start. The barrel length for a home defense handgun is a bit longer than usual, but people choose long guns for home defense, and it will shoot quieter and the mass will tame the recoil better than a shorter and lighter gun.
You have a firearm that's appreciated in value though not radically, but it will do the job you want to do and probably be fun to use while practicing.
I'd recommend keeping it, because you'll probably be a better shot with it, than with anything you'd replace it with, and that's what you want for self defense. Good luck.