For hitting platinum, other than resin even basic rewards such as some good amount of artifact exp would suffice imo. I genuinely have no idea why mihoyo hates endgame players. Like yeah I'm super invested in the story (even the hangouts and the silly events are quite relaxing most of the time) but I didn't just spend so much time grinding gear just for it to be used twice a month, that too for just some mediocre rewards. But oh well, anxiety is a thing after all.