For me, nostalgia is not only about old TV shows but also about everything connected to them. When it comes to series, I still like going back to Quantum Leap. It is very much a product of its time, simple in structure, but the focus on small, human stories still works for me. I also occasionally rewatch Due South, which is a strange mix of police procedural, humor, and a very particular 90s atmosphere. I understand why it does not work for everyone, but it still does for me. There are also shows that I mostly keep as fond memories rather than things I actively rewatch, like Sliders. The core idea is great, but watching it now really shows how uneven the quality becomes from season to season, so it feels more nostalgic than genuinely enjoyable.
Nostalgia for me also includes games, and not just ones I can easily replay. Every now and then I think about an old game I seem to have completely lost track of, and at this point I have mostly given up hope of ever finding it again. It was Wheel of Time themed but not actually about the story itself, more of a gambling style game. From what I remember, you could enter it and choose what you wanted to play, something like picking poker, then going back to a main menu and switching to blackjack or other card games. I have tried looking for it on sites that specialize in that kind of thing, including places like somagyarkaszinok.com, but I have never managed to track it down. My best guess is that it was some kind of limited or seasonal release tied to the launch of a new season of the TV show, which would explain why it seems to have vanished completely. It is a different kind of nostalgia, not something I can revisit, just something I remember existing and wish I could stumble across again.