There are several possible synonyms for the phrase "more banzai", which typically refers to a greater level of enthusiasm or excitement about a particular activity or event. Some potential alternatives might include "heightened excitement", "increased fervor", "even greater enthusiasm", "amped-up fervency", or "exponentially more energy". These phrases all convey a sense of increased intensity or passion, and could be used in a variety of contexts, from describing a sports fan's reaction to a thrilling game, to talking about the level of engagement and passion displayed by a group of activists or volunteers. Ultimately, the exact choice of synonym will depend on the specific context and tone of the conversation or written piece.