Re: A few words of Interview advice
So now you need to get involved in depth in an application area. What is that code for?
I had similar skills to you in my late 40s but got involved in ERP systems, which were fashionable at the time. I also learned some accountancy and did some general business training.
Then I joined a startup. I knew how to integrate what they were trying to do with the backend, and I knew how to turn it into financial data. I became a consultant who could write PoC code. Then I got a lot of the code written.
It's a bit like being a plumber with a strong visual bias who decides to start a bathroom shop, or an electrician who diversifies into selling lighting. You can provide a front to back service instead of having to rely on subcontractors whose skills and capabilities you don't really understand.