You could look into: companion planting (some plants help or hinder others. Eg, basil and tomato are good friends); no-dig gardening (alongside having a good soil microbiome); green manure; sacrificial crops to lure pests away from your main crops; aspect and soil type.
Higher potassium and phosphates increase flower and fruit growth. Higher nitrogen increases leafy growth.
Don’t grow the same type of plant in the same patch every year.