That’s on you. If you’re very very very desperate for this character, than by all means. Good luck with the 50/50 and if you’ll have enough primos to wish them. If you’re 3 or 4 wishes away from your 90th wish, than sure. The thing is, every limited character in the game is going to eventually get a rerun (rate up) sometime in the future. For the most part, from my own experience with previous gacha games, the rateup won’t happen for about a year. The reruns that we have right now: Venti, Klee, Zhongli, and Childe are here roughly 6 months since their release. That’s also with a very small list of limited 5 star units. Since the game growing and more 5 stars are added to the roster (random tidbit, but Eula and Kazuha will be coming out soon) the possibility of a rerun is going to be pushed further back.