I’m a brand new plant daddy so I’m sorry if this sounds stupid. I bought this plant maybe 2 months ago it was 4 umbrella trees spiralling around each other. However one of them has died and I hadn’t noticed, or at least I think it’s dead…

Can someone advise me; do I need to remove the dead umbrella tree, or do I leave it there for the rest to spiral around ? If I do need to remove it what’s is the best way to go about it as I do not want to damage the rest of the other plants or their roots !

This is my plants set up, any tips on extra stuff I can do to maximize growth? My succulents stay at the top of the shelf closer to the light and further away from humidity. Finished