We recently got Venti's third re-run, and so far, Kazuha only had one promoted banner. There was a lot of misinformation on Youtube videos about his abilities and utilization in team composition, so many players refrained from pulling on his banner. As players started to learn the benefit of his abilities, he became one of the best support characters in Genshin Impact. For the same reason, I couldn't wish on Kazuha because some YouTubers said he's not good at all. Well, I should say I regret that choice a lot.  Coming to his re-run, its' highly possible that he may have a re-run soon after Venti because we have Ayaka re-run right now. So, I won't be surprised if Kazuha gets a promoted banner soon enough.