Listening to (archive of) that twitch hurt my brain. I will assume we have the basic sense to not charge into the "intermediate daily" (costing nearly your whole earlygame sta bar) that gives CC mats when you don't even have a single unit close to CC (requires max level). Given basic intuition for optimal play:
- Wed/Sun dailies for EXP fodder. Once your units reach Lv 30+ you'll want med/large fodders.
- Sat daily for gold. There are gold sinks in this game of which CC'ing is one.
- Explore (aka "gather") reloads sta by 0-60 (RNG)
- 5 flower stones for 1 gacha roll, 1 stone for sta reload, 1 stone for +5 inventory space
- On level up, full sta reload as well as explore ("gather") reload
- Early story missions are trivial: the standard 'level up quickly when you first play the game' trend
- On DMM, we get (assuming all maps are cleared) 16+ flower stones every 2 weeks. That's before counting login bonuses and other promotions.
- Normal gacha goes up to 4* girls. On DMM, we recently got the feature to do 100-pulls at once. Such is the abundance of normal gacha seeds.
- Conveniently, we also have the feature to one-click-mass-sell 3* and below.
- 5* (gold) girls are the 'base power' rarity. All the free event girls are 5*. 4* are functional when you invest in them.
- 5*/6* girls will have personalised sprite animations.
- Farming for CC mats (dragons) for 5*/6* girls is grind hell. You start to hate the smug smile on them mats.
- Affection gives significant stat bonuses. Double for CC'd girls.
- You may dislike the CC'd portrait of your waifu.
- Raising affection costs the same mats regardless of rarity. I will totally understand if you pour gifts into a 3* waifu, but make sure you actually like them as you won't be deploying them once you have 20 4*+ girls.
- Caveat: region-specific dailies. Each girl comes from one of 5 countries/regions. In addition to the usual daily, a second daily requires you only deploy girls of a specific region. They tend to be easy though (so far at least, can't devote much sta to them due to non-stop events).

Nitpick: ok it might not actually be called "class change" but you know what I mean by CC.