Wow, congrats on the wonderful recovery! Yes, orchids can be slow growers.
About promoting more robust growth: Considering you are growing in bark medium, you may want to increase your watering (although that advice is just based on the appearance of the surface bark in the photo; if it is already moist underneath, don't overwater.) You can also consider fertilizing more in the summer and increasing overall temperatures – Phals are generally warm growers, although the hybrids are a bit less picky.
Also, it's generally recommended to disturb the plant as little as possible, but the plant does look like it's growing out of the medium, so at some point you may want to repot it lower in the substrate.
I hope this helps! You are doing a very good job taking care of it already.
Edit: looks like we posted our replies within a minute of each other, Roberta!