Creative and IRL categories have been available, in some form, on Twitch for nearly 3 years now, ever since the Bob Ross series was marathoned. Yet, despite the existence of these categories, people are woefully unaware of the existence of any of them, except the biggest two: Just chatting, and Music and performing arts. The latter of which is usually overrun by 24/7 radio channels, while Just chatting is still a "catch-all" category for even content that should be categorized under the specific ones (eg. Travel and outdoors, etc).

It's not uncommon for people to comment along the lines of "wow, I didn't know people were streaming this on Twitch" when a Creative channel is raided by a Gaming channel, or when a musician is raided by a Gaming channel. "Actual talent on Twitch" is a bit of a meme now, which I've heard so often myself.

My suggestion:
https://www.twitch.tv/directory needs to change. Instead of mixing in the non-gaming categories with the gaming one, and sorting them by viewership, pin the non-gaming categories to the very top regardless of viewership counts. These categories desperately need the exposure, and have some of the most unique content on Twitch (and most of Twitch is still unaware of their existence). This will not impact the gaming channels, as people already know that Twitch is a platform that started off as a game streaming platform. The gaming categories can follow below the non-gaming ones, and will still be sorted by viewership.

People need to know that these categories exist, so that more people will explore them, and discover the unique streamers. Streamers who have so much creativity to share with the rest of Twitch.