Avoid unnecessary battles with low level enemies. You'll know this when your allied morale (blue) is greater than the enemy's. To raise your party's stats almost EVERY BATTLE, deliberately start the battle with the enemy's morale greater than yours; technically speaking... allow enemies to ambush you and get the first strike.

Do this one enemy at a time to avoid to much problem. It will take a while and you won't get that much components but this is guaranteed to boost your party's stats immensely without speeding up the increase of your Battle Rank (higher BR = difficulty against enemies)