Overwatering is the number one killer

Roots do two things: they drink, and they breathe. We remember the drinking and forget the breathing. In healthy soil there are air pockets between the particles, and roots pull oxygen from those pockets. When you keep the soil soaked, water fills every pocket and the air is gone. The roots cannot breathe, they suffocate, and once they are weak the opportunistic rots move in. this is why overwatering is the single most common way houseplants die.

So the goal is a wet-then-dry rhythm, not permanent moisture. You water thoroughly, then you let the soil dry to the point the plant wants before you water again. That drying phase is when the roots get their air back. A plant sitting in soil that never dries is a plant that is slowly drowning, no matter how healthy the leaves still look on top.