I guess that everybody takes it the wrong way when people said "set n forget" business. Of course it doesn't mean 100% forget it". It means almost no need to invest alot of time.
Besides, if you have set a working profitable business, why in the world you need to forget it?
Anyway, my suggestion is :
RENT A LAND AND PLANT SOME MANGOES OR OTHER FRUITS.
In two or three years you hire someone to harvest them and sell them to store.