SSF KF Hiero - Upgrades Path?

Hello! I started a SSF run a couple of weeks ago and farmed some gear for KF Hiero. Here's my character: https://poe.ninja/poe1/profile/Nezla-0521/miragessf/character/KFSSFCosmyc

Besides the obvious (Doing Merc and Uber lab), what are some of the things I should be working towards or change? I've read to try and get the Aul Bloodline so that's one thing I'll start working towards. I'd like this character to be more of a bosser since my Ele Hit Slayer is good at mapping.

I'm not very well-versed in SSF so any input on how to make my character or maybe atlas trees better is appreciated!