In my opinion, the opposite of doomscrolling is this:

Pick a video game you like, search the OST playlist on YouTube, and read the comments from people

fondly reminiscing, sharing, and storytelling about their experience with the game. It cleanses my soul.

https://www.youtube.com/watch?v=h7KLbnwn6Fs&list=PLxdQfrU9eTcODOWrwUvGg-zTP_zZXM-HK&index=14