One possible reason why your plant is not growing new leaves could be that it is not getting enough light. Make sure to place your plant in an area where it can receive plenty of bright, indirect sunlight each day. Another reason could be that the soil is too dry or too compacted. Try watering your plant more frequently and/or loosening the soil around it to help encourage new growth. Finally, consider whether your plant may be suffering from a nutrient deficiency. If so, you can try fertilizing it with a balanced organic fertilizer to help promote new leaf growth.