Check youtube for "2.4.1 goblin farming diablo 3" or something similar and you will find lots of gob routes. Whatever routes you go with try to change it up often or you might find that the gobs dry up really quickly. It might help your mental state if you have some other goal (e.g. getting 100% of the achievements, farming the unique blue items, getting the pages to solve the book, etc.) instead of just farming cosmetics. Good hunting.
Goals like running bounties? Just run your bounties as needed and you'll bump into these goblins all the time.