A box grow

It is my concern that her leaves turning pale and her stem not growing properly. Her top leaves look healthy but a little bit yellower. I try feeding more nutrients as well as flushing, yet the situation does not change. I try to transplant her into a larger pot. During the migration procedure I find her roots spanning beyond the pot. She needs a larger room for further growth of her roots. Her body is now planted in a 11.4-litre pot. Today I find she has much more leaves than that of the last week. Since the pot is filled with compost, no nutrient is poured on her for now. "The roots below the earth claim no rewards for making the branches fruitful." In the city of New Leningrad, 2021-02-15.