If you want to grow straight, you can set a certain support. Put the bamboo and the flowerpot together on the wall, or insert support in the flowerpot, so that the branches can grow up along the support. It can also be tied straight with rope or wire. The new leaf just grows about 10 cm. Tie it up with rope so that the branch can grow upward through external force. You can also cut off some of the roots in the soil and bury them a little deeper.
