ZDC UR Tears to Tiara Kakan no Daichi ティアーズ・トゥ・ティアラ Portable 18 Easy Mode 2nd Last Generic Class Changes and Leveling plus Shop Buys

You don't really need to level the Minstrel as you won't be able to use him in the last set of Story Battles, but for completion's sake. Also, all shop items and equips you can buy should now be available (unless you saw all Epona Events?) So you should not have to worry about equipment upgrades making your purchase useless. Also, when you hunt rare equips, you will easily get money that can be half the max after you are done, so money won't be an issue anymore.