You can always improve your technique.
And while it is true that every single slinger works best with different techniques, 'just do it' won't necessarily improve, whatever aspect of your slinging you want to improve.
There are ALWAYS things you can do to improve.
And once you've made a change, it's back to repetition, practice and repetition to see if the changes make any real difference.
There is no magic ' one size fits all' method.
Which seems to be the crux of all these 'how do I hit smaller things more often' type of threads.
There are some basic biomechanical improvements we can all make that will reduce joint strain or incorrect muscle emphasis.
But again, they differ for each slinger and each slinging style.
The only thing that is universal is: 'practice'
Even the worst technique will improve with sufficient usage.
In some ways it was better in the days before YouTube and the internet ( for our younger members, this was less than 30 years ago).
You were on your own, you'd never seen another person using a sling and if you didn't get it right, you'd generally end up hurting yourself
So instead of wondering what technique you should be using, you just used what seemed to work best.
These days it's far too easy to spend so much time thinking about the angle of your elbow, or whether your foot is half an inch too far to the left, or that the chap on the last YouTube video you watched swears a 27 and seven eigths sling is definitely the best, that the sheer joy of just slinging is lost.
Slinging is one of those activities that can be so overcomplicated that you lose the enjoyment and end up getting frustrated.
So as part of any training regime I would recommend making time for a period of 'free slinging'.
Go find some countryside, or a pebble beach, or wherever you have, that you can just amble around for an hour or so, randomly picking up stuff and slinging it.
With no other goal than just watching things fly without the pressure of needing to throw a specific thing in a certain way at a specific target.
It'll help reset both your body and mind.
Slinging should be FUN.
And you will most likely learn more by simply playing around, than by setting unrealistic goals.