Finding a solid place for those Chinese overpower isekai shows can be a real scavenger hunt. A lot of the official platforms are region-locked, which is endlessly frustrating. I've had the best luck with YouTube, honestly. Channels like 'Ani-One Asia' or 'Tencent Video Anime' upload a bunch of their licensed stuff with subs. 'The Daily Life of the Immortal King' and some seasons of 'A Will Eternal' popped up there. It's not a complete archive, but the quality is reliable and you're supporting the official release.
Crunchyroll has started picking up a few, like 'I'm Actually a Cultivation Bigshot,' but their catalog is still pretty thin compared to the Japanese stuff. For the deeper cuts, you might need to venture into the wilder web. Sites like Gogoanime or 9anime often have fan-subbed versions of series that never got an official English license, stuff like 'Rebirth of the Urban Immortal Cultivator.' The video quality can be hit or miss, and the ads are a nightmare, but sometimes it's the only option.
My advice? Start with the official YouTube channels to see what's available legitimately. If you hit a wall, then you know where to look next. It's a bit of a process, but tracking down that perfect power-fantasy series where the MC just wrecks everyone from episode one is totally worth the hassle.