general tips:
quick lvl up of kami: run expert gold cave on sundays. best place for exp.
do upgrade quests on sunday, limited time quests on sunday, appears 3 times throughout the day, for one hour each. drops enhance materials
work on skill lvling your strongest assault ssr weapons using R weapons you pull from gacha. also use useless sr weapons as fodder. there are guides written on this so try to find one.
advent battles: just run ultimate, pot when you can, always do daily quests for the extra pots
raid events: during burst hour. hit close to death raids. burst atk, hopefully mvp. end raid. repeat. otherwise, do near full health raids during normal hours. mvp gives extra soul and more tickets.
daily mission tip: for the raid mission, you can join in and do nothing. raid will end when someone else kills it. you get refunded your bp and it counts as "assisting" for the daily mission.
also try not to waste ap/bp. like using 2 half elixirs and then lvling up. if you use one half elixir and it puts you near 60, or 30 after one run, wait it out. uses energy leafs if you have any when you have zero bp. otherwise, use 1 seed if only 1 bp available, etc. just plan to use your resources effectively
edit: also run disaster raids for sr weapon drops for fodder