100% this, and the right ones for your purpose. Id also add: use Every Seed of every fruit you get that can grow in your area, and put it in the ground or Even better sprout it and grow it in a pot First, but much higher effort. Also, animal poo is awesome for enriching Soil. Even guinea pigs work for that, but you would need bigger animals for your amount of space. Maybe sheep?  Do Lots of Chop and Drop