What I typically do is listen to some music. I have a collection of soundtracks from some of my favorite video games. I pick a couple of pieces from the whole collection and let the music lead me through my memories. It’s not too far off from the feeling of going through an old photo album. I imagine one could get a similar effect by returning to any number of things that they used to enjoy.
I know it’s a long article guys, but it worth your time. This summary is a mess and completely removes crucial details, including all the quotes the summary alludes to. If you’ve got 30 minutes and are genuinely interested give it a read or a listen.