First, Welcome!
That is one amazing plant! You have done very well over so many years!
I would be puzzled on what to do next, too! My inclination would be first to soak it for a bit, to try to loosen up the roots so that you can see what's going on in the middle. Both the roots and the leaves look very, very healthy. If you can get into the middle (perhaps from the bottom), maybe try to coax out broken-down medium and rotted stuff. I suspect that there isn't a lot of medium left. Rather than getting rough with it and trying to get it apart, you might just drop it into a larger pot, fill in with some fresh bark, and let it spread out for a year or so. Then do another repotting, at which point it may be less impacted. It has done so well, I'd be inclined to be gentle. I have used the "superficial repot now and more thorough cleanup in a couple of years" approach with Cymbidiums that look like that, with some success. After having more room for a year or two, some of the old, leafless pseudobulbs are easier to separate from the newer ones, you can find the "weak points" to get it apart without brutalizing.
The alternative is to cut through the root ball and divide when you can't disentangle the roots, but that tends to set the plant back. I'd hate to do that without giving the slow approach a chance to work first.
Last edited by Roberta; 05-14-2023 at 01:13 AM..
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