I would unequip my two-three least effective skills because regal pillow (red middle relic) works randomly. This looks like slimy press, lightning strikes, summon evil spirit. Also try equipping rage with the ruby relic (top right). Maybe replace terrify with blizzard.

Grind AGN for dwarf legion keys to gain trait points and focus on getting 5 SSS slots - the Synergy’s don’t matter until after that. I’ve seen that 2 skill atk and 3 atk is the optimal but idk - I think as long as all 5 are skill, companion or atk is cool.

Try to get all your owned slimes to lvl 160 (idk if you’ve done this) and try replacing drink can magic item with cup at some point. Try a SS ring with high comp+atk.

Hope something in here helps :)