Keep track of the content you love. You will become nostalgic in your 20s and from what I've heard, nostalgia never stops. You will want to revisit the things you loved in your childhood, especially ages 14-17. These are formative years for developing opinions. Technology makes it easy to remember this stuff. If you see a TikTok you really love, upload it somewhere. If you see a movie that you really love, rate it on IMDB or write it in your notes.

I can't tell you how many things I feel nostalgic for from my childhood that is out of my reach because I didn't document it. A small YouTuber who deleted their channel. A movie that almost no one remembers. A scene in a book I no longer remember the name of. A song by a local band that never uploaded their music.

Just try to hold on to these things. Your older self will thank you. These will become comfort media for you.