Hi, Joe.
I’d say that what you’re after is something that will become innate/easier the more tunes you work through. The more you go through the process of learning a basic version of the tune and then adding in the triplets, ornamentations, double stops, variations, etc. that are included in the advanced lessons, the easier it will be to do this for other tunes not taught on this website. You will be building up a bag of licks and tricks you can plug and play in any number of tunes.
I know that probably seems like general advice, but I think what you’re looking for will happen naturally the longer you play fiddle tunes/the more fiddle tunes you work up from basic to advanced melody. Hope that’s helpful, sir!