I am new to this game and I would suggest the make gacha events that last less time like 2 or 3 days that have old outfits and accesories that were already being given. It can be 2 events at the same time that would help the new players that want the have old accesories that they don't have, the chance the get it and I am sure they would spend money on those short events that recycle old outfits and accesories.

For sure it would make the gacha events more interesting because you see more new events coming in and out not the same new events that give new reward that last week it get boring because the players might already get everything they want from the event or simply they don't want anything from that event.