Hello annettegutk, I think it is still acclimating to its new set-up and then the seasons changed, and it went into dormancy. You did say you even tried giving fertilizers, but it is of no use at this point if plant has gone dormant. It may have been adding more trouble to it, since it is still recovering from the transplant stress it had.
I do not know where you are located, but to me it looks like it has entered dormancy. I would probably change the media since it is dormant anyways, just to remove the excess fertilizers it does not need at this point, and respect the dormancy part it is undergoing. Cut off dried out branches, dab with a little cinnamon the cut off end. As long as the rest of the caudex is staying firm, it should recover. Give it time, keep it warm and dry, and wait patiently for the plant to wake up on its own pace.
I remember my plant did the same thing before when I did a transplant around the end of summer. Cooler fall temps came in a few weeks, so it just went dormant. Came back nicely again in late Spring. Just have to wait patiently.
Also this plant can be in bloom but still categorized as dormant. Or hold on to older leaves, but still considered dormant. Got to wait for the new batch of leaves to actively grow again as a sign it is waking up from its slumber, then you can resume your watering regimen and fertilizing.
