Taking photos/videos of the things you do now
Unless if you're doing some illegal shit, taking photos/videos of even everyday, mundane even repetitive or dull tasks is such a good idea. When you look back at your photo library (I use Google Photos which has unlimited storage), you will realise how much life has changed. You may even get a feeling of nostalgia. Sometimes you feel transported back at the moment.
Even if the photos or videos you take now are cringy, don't delete them. Save them. Hide them if you need to. Future you will thank you later for taking the time to do so. Even the most mundane of things can send you back - because you'll probably forget them one day.