Examples of proof of traction for OC1 and OC3

One more question, I’m currently working on my personal statement, and I have a question related to how to answer: What I am going to do in the UK.
I’m currently not based in the UK. My plan is to start another startup in the fintech space which is why I specifically chose the UK. Do I need to give any specifics on the startup idea?
Does anyone here had a similar situation can help me how to answer this part?
Has anyone got a rejection based on this before and asked them to apply for the Innovator’s Visa (startup visa).
This is my full evidence list I’m planning to submit: Exceptional Talent: Review my application + Few questions [URGENT]

Thanks a lot.