notebook.ai is another site that I like to use. It’s kind of like charahub where it lets you create and organize character profiles, but it is also good for world building as it has separate categories for universes, locations, items, etc. As for the forums they’re fairly active and divided into sections such as the general chat, characters, writing prompts, etc. etc. Plenty of people on the website actively write and are happy to give writing advice, character critiques, etc. My only complaint is that there are certain categories you need a premium subscription to use, but I kind of understand it cause the website has to make money somehow.