I bought a new ping in a true Death Cube about a month ago. It came in a small pot and hasn't gotten any bigger. Would it help to pot it up?

Also, I have three other pings, same species but NOID, that I've owned at least since last winter. They started big but are now not even half as large as when I got them. A couple are about the size of a quarter or maybe 2.5 cm diameter for our non-North American correspondents. They appear healthy, but I'm wondering what I might be doing wrong. They're growing in LFS mostly and I keep them wet all the time. They're outdoors getting some direct sun and some filtered.

Like I said, I don't know the species, but it's the kind I always see on sale at nurseries, in the silly packages. Very round leaves.