The soil needs more power! You can use old tea and coffee (brewed) (i mean you drink the coffee, and then you use the grinded beans as fertilizer in your soil)
Eggshells are good, peels of banas (cut in small pieces), small pieces of fish, rotten vegetables, wormshit...
You might want to try a different nutrition or other soil. Bigger pots might help ,too. Calmag, can be made with vinegar and eggshells.
Slava ukraine!
FraFra