I don't really understand G&G at all, is there a good guide you can recommend? The dice faces and paths just confuse me
There are no good guides since most of them are about how to cheese it, but basically G&G (and Swarm Disaster) are all about using the path and dice effects to maximise your damage.
First pick a path that suits your team (you have Argenti, who's main source of damage is his ultimate, so pick Erudition path).
Then comes the dice. Which dice you pick doesn't really matter as long as you can fulfill the condition for the passive, but I do recommend the Pursuit dice as it has the easiest passive to trigger and can help in getting as many blessings as possible without cheating.
Problem are the dice faces. You want to pick the ones that can help trigger the dice passive, so read the description carefully.
As for blessings, the ones I recommend for each path are
Preservation: the one that gives you a stackable shield, the one that increases shield strength and any blessings that gives Quake damage.
Nihility: Hell is other people and any blessings that increases break effect (the others only help with Dot teams)
Hunt: Auspicious Star which recharges your ultimate each time you defeat an enemy (and if enhanced, makes it possible to have unlimited Ult.) and any advance forward blessings.
Abundance: the blessings that blasts healing to all the team + the ones that have Dewdrop
Elation (if you picked Erudition path): the one that considers Ultimates as follow up attacks. After that pick whichever helps boost follow up attacks
Elation (no Erudition path): all of them are good, but you'll need someone that can do follow up attacks (like Ratio)
Erudition: any blessings that has Brain in a Vat. + The one that revives a fallen character.
Destruction: Blessings that contain Fighting Spirit and the one that revives a fallen character. There's also the one that splits damage between allies which is great, but G&G has alot of Aoe attacks that do alot of damage, so you'll need a good shielder and other defensive buffs.
Remembrance is hard to use so I wouldn't recommend it and Propagation is best as a sort of sub path.
As for Occurances, if you get the Ruan Mei Occurances, always pick that and avoid the Unending Darkness and Nildis, Occurances. The one called Cosmic Crescendo can be useful early in the run.
If you see the Cheating code Occurance, always pick the first option, as the other will make you enter combat the next time the Occurance appears.
For the bosses, don't pick Gepard, the Deer or the Twin robots as they are the hardest.
Other than that I'm not sure what to say. I recommend not doing G&G before you got another good Sustain (you could go for Aventurine next week) and have good builds for your characters.