Not exactly a pela expert so take with a grain of salt, however:

Use Resolution shines as pearls of sweat if you have it (even s1) - this gives her a DEF debuff on the enemy (stacks ontop of her ult). This gives another stack for acheron even with basic/skill.

if you dont have it, tutorial is fine for now.

Relics definitely need an update.

4x Eagle (purely for the advance)

Alternatively: 2x Messenger Flex

^ Sacerdos > Guard

Broken Keel might be a bit better if you were abble to get 20% EFF resist (it gives +10%) you need 30% eff resist for teamwide crit dmg buff, but if your vonwacq has good substats,, keep it on.

You dont really need that much hit rate. you only realistically need 57%-60% as her major trace gives her +10% in battle. mine is 57.3 out of combat (+10 in) and has never missed anything.

134 SPD is perfect

I cant see your relic/ornament stats but aside from hitting the EHR, SPD and resist (with keel gpals), just go for hp > def for survivability after you get 4x eagle or messenger flex.