Hate to say it, but I'm came here looking for a ...
...closet botanist.
Have a plant now for about 13 years which, when I purchased it, consisted of 5 small individual 'trunks'...not touching, but in a tiny plastic container.
I've re-potted it a couple of time and the stalks have reached a height of 3.5 to 4 feet.
And here it is now....

Problem is that over the years, I've discovered that the new stems growing off the stalks become inhibited or sorts whenever the 'baby' leaves come into contact with mature leaves.

As a result, it's more in the shape of a tall bush...which is fine...but I'm going to now re-pot it into a very large pot that will sit on the floor instead of on a wrought iron decorative base.
My thinking was to pull apart the roots...or cut them apart so that I end up with a plant that for the most part, allows all new growth to flourish with "no contact" with other leafy stems from one of the other 4 trunks.
Will I end up killing it? It would break my heart, as it's "special". Should I maintain it by putting the root ball into a larger pot and simply walk away?
Any advice?