Fast levelling guide as corpse explosion Necro?

Hello.

Recently I have lost my Necromancer to a huge lag spike in a middle of demon army. I know that I cannot get him back due to Hardcore, but can I at least get some tips on how to farm levels and equipment fast and safely so I won’t fall trap to it again? Because doing it again and again over and over is frustrating a lot. Thank you.

https://maxroll.gg/d2/guides/necromancer-leveling