Add more "generic" gaming Categories; for example the Retro category
It is from my experience that the Retro tab is the most streamer friendly category for starters, since the viewers who browse the category usually are just scrolling it in hopes to find something interesting to watch without having to look for someone or some game specific. This ends up creating a very good growing spot for smaller streamers since it can be more easy to attract viewers by just playing whatever retro game without having to use that game's specific category that usually noone would be looking at
For example: right now there are very few people watching donkey kong country on the DKC's category but if a streamer were to stream dkc on the retro tab maybe he would be able to get the attentions of fans of that game that just happens to be scrolling the retro tab
This wide shot of a category is good for streamers, it's awful to be tied up to a category that noone is scrolling through since you have less reach
So the suggestion is to create more general categories such as "Action Adventure" "Action Rpg" "JRPG" and be able to have the general category + game category all tied up to the same stream type, that way you have a broader reach both on people who are scrolling the general category and who are looking for a specific game to watch