It all comes from four places, and you can check every one.
1. Saved memories
Settings, then Personalization, then Manage memories. That's the actual list. Delete anything you don't want it using.
2. Past chats
In the same Memory settings, if "Reference chat history" is on, it also draws on your previous conversations. Turn it off if you'd rather it didn't.
3. Custom instructions
What you told it about yourself and how you want it to answer. Same Personalization screen.
4. This chat or Project
Whatever's in the conversation or Project you're working in right now.
The four prompts
Run them in one chat, in order. Let it answer each one before you send the next.
Based on my memories and what I've told you, who do you think I'm pretending to be, and who am I actually?
Be brutally honest. What are my biggest blind spots running my business?
What's one habit that's keeping my business stuck where it is?
If I fix that, what does my business look like in five years?
How to read the answers
It only knows what's in those four places, so it can be confidently wrong. After any answer that stings, ask "What did you base that on?" If it points at something real, think about it. If it can't, drop it.