Any way to increase crop plot size?

OLD = Hey, I’m interested in obtaining/making a mod to increase how many berries the crop plots can hold(currently 299 max) I’m a complete beginner to modding, any help or guides in the right direction would be appreciated.
NEW = I’ve figured out how to do it, I just have no idea how to make it a workable mod. Do I need to fix the reference viewer? It looks different from the non-changed crop plot blueprint. Also when attempting to cook/upload to steam I have to set a map for it? Do I just type theisland? or something else?

Did you manage to fix this?