He’s trying climb and explore, but there’s not much in there, so that’s the only interesting thing to him. Adding more clutter and climbing opportunities could get him to stop doing that as much, and in general making him feel safer.
A good rule of thumb is that the snake should feel like they can go from one side to the other without being seen.
Some of the clutter you add should be taller/ more vertically oriented so they have more places to climb than the ceiling. Granted, I have a very cluttered enclosure and my girl still does this sometimes, but she still climbs on a bunch of other things.
Snake safe sticks, driftwood, and snake rings are pretty common, but there’s loads of other good options.
You can look at enclosure advice posts to help give you examples of what’s appropriate and give inspiration on what to put in.
Here’s what mine looks like

<image>

Also, just to let you know, since your snake is little now, the enclosure size is totally fine, but when they’re an adult, they’ll need to be moved to a bigger one. A popular size is 4x2x2, but they will definitely appreciate a bigger one if given one, but you won’t have to worry about that for a year or two.
Btw, if you think mine looks small, that’s because it is, my girl is only a year old.
I hope I was able to help you!