I once bought a router to use for my internet when I moved into my new house just to find out that it “wasn’t compatible” with Verizon’s service. I still have it (because I’m terrible about returning things). Is there any point in keeping it? Is there anything fun or interesting that I could do with it?
You could probably turn it into an extended access point or something like that. You could also set it up to be used in like let’s say a lab or something like that. If possible, check what router it is and see if you can put OpenWrt or something like that on it.
If not, collecting dust in a box isn’t a bad idea either, just if you decide to take it out again to clean it thoroughly.