Originally Posted by Ancarius

6. Push to Chapter 11 onwards as soon as you can and not spending your time trying to 3 Medal every Dragon Mission you don't need and every mission before Chapter 11. :S

Don't listen to this advice. Aside from the dragon missions, fully clear every mission you get before you move on to the next.

a) You get more flower gems, which you said you want to save.
b) You get more affection items, which lead to a huge increase in power.
c) You get more 2* units, allowing you to max out some 3* or even 4* girls' skills.
d) You get more bonus maps = more gold, more gacha points, more manyu, stronger units.
e) You get more raid bosses because you can fight more often.
f) You get more experience per stamina usually, letting you level up faster and use up more stamina.
g) If you get up to higher levels, you won't be able to afford the bonus stages and you won't get as many raid bosses for the daily.