I'm increasingly of the opinion that if we want effective recycling solutions for stuff like this, one of the biggest steps we could take is strong right-to-repair laws. There should be a push for designing things in such a way that they are easy to disassemble, part out, and replace pieces of. Not only does this make things easier to fix and extend their lifespan, but it also would make them easier to disassemble for recycling/waste purposes.
Requiring manufacturers to release documentation (design, components, most common failure modes, common repairs) on their products at some point after they no longer manufacture them is probably a harder sell but would be pretty nice - trawling old forums to figure out how to repair my 12-year-old subwoofer is a pain and unreliable, and having manufacturers responsible for hosting that information would make it more consistently available.