this sure seems like meditation.

it could probably work as well to close your eyes instead of staring at a wall.

i've always found meditation types revolving around focusing on one thing (candle, wall etc), or nothing (empty mind) to be really hard. my mind just wanders and i end up super anxious, frustrated, and exhausted - resulting in me giving up pretty quickly

What I've found is that focusing on "everything" - ie sitting still and trying to observe your surroundings, your body, all sounds simultaneously seems to work much better. It's easier to get to a calm state this way.

Also, doing this while walking can also work - but perhaps easier to accidentally start thinking about something else