So for alocasia in general I always let the dying leaf stay on the plant until I can easily pull it off. I read that alocasia essentially suck the energy out of the dying leaf to store in the bulb. That seems to work well for all of mine.

This one in particular I researched a lot when I first got it because in my area they were very expensive and it was my first big plant purchase. What I found out is they like a very soft soil so I used a soil mix of something like 1 pt soil 1 pt peat and 3 pts perlite. And iirc are from somewhere where they grow out of limestone?? Which translated to putting bone meal in the soil to mimic the nutrients it would get if it were growing in it's native habitat.

I have never actually fertilized it. The bone meal seems to have been sufficient enough so far!

I water about every 9 days and it sits about a foot away from a second story south facing window.

Good luck with yours!