Imitating Prose Rhythm vs Composing in Meter for Learning

Prose with attention to rhythm does sound nice. There are some tools you can use to change up your prose rhythm: repetition, sentence structure, sentence length, where in the sentence the verb falls. I've never heard of anyone specifically thinking about metrical units such as iambs and trochees in prose, but I guess you could. I would think if you're too metrically consistent in prose it would end up sounding too much like a poem. What is your goal exactly? How much like a poem do you want your prose to be? 'Prose poems' are a thing, basically a form of poetry that is written like paragraphs. Maybe you could post a passage from literature that you see as good lyrical prose, and we could try to break down what makes the rhythm work?

I guess even when you have rhythm and meter in mind, it's up to the writer to compose a pleasing rhythm, since prose rhythms aren't nearly as formulaic as poetry ones. No one is going to tell you, "rewrite this sentence so it's stressed-unstressed-unstressed-stressed-unstressed-whatever." So it's up to your own sense of aesthetics to compose something.

Studying and following rules doesn't do the work of writing. I get the impression you think you can only start writing once you know a little more about how to write, but after some studying, you still don't feel ready to write, so you study the rules even more. It's a cycle. Earlier you made a thread about learning the elements of fiction, but no one actually needs those to write a story. Feeling like you need to craft every bit of a story analytically and with respect to the rules is probably hiding the creativity and potential to write freely that you already have.