I want to use an AI to help organize and plan fantasy worldbuilding to an extensive degree. What is the best option atm for that?

I currently use ChatGPT Plus, but I feel like it limits me heavily - due to rate limits, project limits, and memory issues. Are there any better options that would exist for this, where I can organize, catalog, and create new content very easily over one expansive topic?

GPT is okay at it, but it feels messy and hard to use for a project such as this.