I remember making a beastly farm build ages ago for solo when I couldn't get hirling but I don't know it anymore but that was back in 2.0 . Way back then.
.it as a poison aftermath build with crushing blow and farm affixes. Although Epiphany didn't exist and maximum luck and gold was 650% back then. Theres another one , you know, the Flash farmer solo version.
Griffin also had a good solo farm build in his videos. Point is, even without hirlings, you can win the game.