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.
Split run bounties with a known group, and a call out if one is spotted BEFORE engagement.
Not really an issue though as they can be passed around in camp for the transmogs.
WD Season 8 https://www.diabloprogress.com/hero/finiar-1655/Kildare/84509816
Monk season 7 http://www.diabloprogress.com/hero/finiar-1655/MojoJoJo/42225505
DH season 6 http://www.diabloprogress.com/hero/finiar-1655/DeadShot/75655606
Angry Chicken http://www.diabloprogress.com/hero/finiar-1655/WhoDoVooDoo/68187610
What? Me worry?
WD Season 8 https://www.diabloprogress.com/hero/finiar-1655/Kildare/84509816
Monk season 7 http://www.diabloprogress.com/hero/finiar-1655/MojoJoJo/42225505
DH season 6 http://www.diabloprogress.com/hero/finiar-1655/DeadShot/75655606
Angry Chicken http://www.diabloprogress.com/hero/finiar-1655/WhoDoVooDoo/68187610
What? Me worry?