i would start by wondering if it is getting sufficient light .... in that corner ...

ken

Check undersides of leaves for little white larvae that look like grains of rice and/or fluffy white cocoons. Or a sticky clear residue on tops of leaves. If so, it is most likely whitefly, which I am currently battling myself. I have a pachira money tree, a similar looking plant to yours, with very similar recent leaf damage. they are resistant to most pesticides so neem oil is one of the few “pesticides” that kill them. But you have to be diligent and thorough with your application-every 7 days, spraying all parts of plant, particularly undersides of leaves. I’ve knocked mine back some w/ 2 treatments already.

neem is pet friendly & people friendly, btw.its the oil from the neem tree in India. Indians put it in their tea!