reaserch. the events. droprates which events has the most benefits during a fuku deals event. dnt spend right away if theres a fuku event paired with a bad event. maybe the next fuku eventbwill have better rewards and better events along with it. so how to spend coupons is by.. yea ac*ulation /patience

i would suggest youtubers. coffinelement and other streaming narutooas gamers in youtube giving advices of different event droprates. and guides.