Compost tea is the key!!
Buy a bubbler, a cheap one, and put organic things on water and let it bubble for 24h.
Banana skins are great!!
Without bubbles you may dry it and grind to put around 5cm top soil. Eggs on oven become Calcium carbonate, great too.
Any fruit skin is rich in nutrients, just dry and use.
Also, my favorite is beet, grind it and let on water, will become a strong purple water.
Bones on oven are great for phosphorous too.