Disease? Deficiency? Bugs? Leaf issue

Hello, friend! 👋 Yes, that's a fungus from excessive humidity! It seems you watered it heavily and sprayed it often during that time! 👆 Be careful with applying liquids to the leaves and substrate! 👆 Water your plant in the morning with an amount not exceeding 10% of your pot's volume! For the age of your plant, it's enough to water with 150-300 ml of water in a circle around the plant, so the roots grow wide in search of moisture! Do your spraying in the evening, after sunset! Don't combine spraying with watering! 👆 Good luck, friend! ✊😇