For this trophy, you must fully maximize one of the cognition fields from Jose for Mementos. To make a suggestion, wait until the Medjed Crisis is over before heading to Mementos, where Akzeriyyuth will unlock. Once you have gathered stamps here, you will have enough given you've completed all other blocks, to completely full one of the three paths. Go for one at a time before focusing on another.
My suggestion is rooted in raising either Money or Experience, but if you want to quickly gain the trophy, put your stamps in Item growth; it should be capped out much sooner, as suggested by TheBig-BB from the comments.