I have a great idea! Why not add some fertilizer NPK with a ratio of around 20-20-20 or 14-14-14?
How to care for Picasso peace lily?
I pamper this plant by using well-draining soil and feeding it during the growing season. This little guy really shines in indirect sunlight and loves lots of water once a week. Keeping its soil medium to high on the humidity scale helps it stay happy.