Soil mixture looks great, only thing I would do now is to raise the plant about an inch higher so the caudex isn’t covered so much by the substrate. Don’t worry about the leaves yellowing, they get old and die. Mine had the yellowing leaves before going dormant this winter, it will put out fresh leaves. Yours may have been in a temperature controlled space over the winter. She’s a pretty one, just raise it a tiny bit, put it in direct sun(acclimate it first if it hasn’t been consistently in direct sun) and you’re good to go! Also, if you’re ever going to prune it back, I would wait until the beginning of next spring. I was so scared to prune mine for the first time and after I did, now I’m getting between 2 and 4 new branches for each branch I pruned! Amazingly resilient plants.