I suggest that you rotate your plant a quarter turn every few days. It will eventually even itself out.

If rotated clockwise, she's golden ....... a quarter turn counter clockwise will cause the plant to fall out of the pot.

If it doesn't become more symmetrical after you start rotating it, when you next repot you can change the planting angle. Also, this isn't a good time to be pruning a lot of foliage from your plant, but come Jun (if you live in the N hemisphere), you can snip off the stems that contribute to the lack of symmetry.

Just FYI, many endeavors which require an artistic bone or two make much use of triangulation because the triangular silhouette looks most natural. Arranging rocks or trees as eye candy in the landscape use a great deal of scalene (3 sides of different lengths) triangulation in their designs. Bonsai, kusamono, shitakusa, bonsai, and other originally eastern arts which make use of arranged plants rely heavily on the triangular silhouette of not only the plant, but how they are arranged in relation to other plant's/ objects.

Al

And bear in mind your plant, Thaumatophyllum bipinnatifidum, is a vine, not a shrub or tree. It’s always going to be a bit floppy. It’s looking for a tree to climb. The stems in your picture are actually leaf petioles. Pruning them off will not improve the structure of your plant since they cannot branch.

What a wonderful education you all are providing. Thanks. Much appreciated. My husband and I are still just so thrilled that we haven't killed this thing. It feels like a bonus to even think about these details.

Even though I am a major garden enthusiast, I have always loathed houseplants. They just creep me out on a visceral level, hard to explain. I friend convinced me to get two of them when I was staging my house for sale earlier this year. I saw just how they can transform the look of a space with color and shape. Slowly, slowly I'm coming around!