Of course, very happy to assist and thanks for your patience.
Essentially, you need to be honest, be child-centric, and please don't use the interview as a counselling session or as an opportunity to say negative things about your ex-partner.
Make sure you have prepared any documents and information in a folder that you may want to refer to, but remember that the Cafcass Officer is not going to want to read hundreds of pages of emails and text messages - they want to get to know you and to work out if you have the child's best interests at heart.
You should refer to the welfare checklist as a bass of the approach you should take, as this is how the Cafcass Officer constructs (or at least how the should construct) their report.
The welfare checklist is here: https://childlawadvice.org.uk/information-pages/the-welfare-checklist/
Essentially, the fact finding is over.
Now it's time to move on from this. Focus on what you are looking for moving froward. Raise wider issues of concern, but focus on your child and the reasons why contact should be ordered.
I trust that this assists?