How to link different adsets to actual conversions & optimize?

Hi so I have always done dynamic creative but am not switching to 3 ad sets p campaign. Was wondering how do you actually link performance with different ad sets to results aka conversions.

E.g. if it's a chiropractor i'm working with and i have 3 ad sets:

Chiro neck pain - skit style video ads
Chiro neck pain - scripted video ads
Chiro neck pain - video + image side by side ads

Then lets say they all get leads, but of course a low CPL doesn't necessarily mean good quality.

Chiro neck pain - skit style video ads = 10 leads x $10 CPL
Chiro neck pain - scripted video ads = 8 leads x $15 CPL
Chiro neck pain - video + image side by side ads = 10 leads x $9 CPL

And say

Chiro neck pain - skit style video ads = 4 bookings, 2 no show, no conversion
Chiro neck pain - scripted video ads = 3 bookings, all convert
Chiro neck pain - video + image side by side ads = 4 bookings, 2 no show, 1 conversion

How do you know which bookings came from which ad set? Use a slightly different lead form?

And how would you optimise from this point? Kill Ad set 1. and focus on Ad set 2. + Ad set 3. etc.

Thank you

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