Phrase or saying to mean proceeding from a point of inspiration

I was typing a comment and couldn’t word it correctly, or rather, couldn’t remember the phrasing one would normally use for that situation. So I stated, ‘I was going with the "godly" part’ (as my inspiration*); meaning I felt that the adjective godly, in the OP’s example sentence, was a significant part of the context and that I should proceed from there (to search for a short phrase having that connotation, allusion, etc.).

While clicking on synonyms, I did find the word brainwave. It hasn’t helped.

• I was going with that.
• I was running with that.
• I took it from there.
• I expounded… (No, it’s not detailing.)
• I expanded… (On one word?)
• I focused on "godly" and went from there. (That lacks inspiration.)
• jump-started, springboarded (Too much…energy.)

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Update (18 March 2021)

I found an example sentence that conveys what I’m trying to say, very well, but it’s in a different context (a group setting; plural imperative), and I would prefer a phrase that encompasses that meaning, if possible. (Source: Macmillan Dictionary, under run with it.)

Let’s pick up this idea and run with it.

*The phrase as my inspiration was not part of the original comment or this question; it was added for clarity to both later (March 11th and 18th, respectively).

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Maybe I’m searching for jargon, but I don’t think so. It could be embarrassingly simple; it happens. In any case, I’ve searched for hours and can’t find it.

BTW, this is just a question about an actual comment I made concerning a quest tale, nothing more. (Full context, under harrowed souls, 2nd to last answer.)