I concur. I think I'm a little ahead of you in this journey; only setting eggs from older birds (including a 6 year old, all of whose chicks from last summer have done well) has worked for me.
I am trying to revive it; you (and @Karoo permaculture ) might find this interesting
https://www.backyardchickens.com/articles/wholesome-home-made-chicken-feed-without-sweat-tears-a-calculator-or-deep-pockets.78655/
I think this is a bit naïve. Vinegar is a good cheap cleaner of most things, but companies make and sell chemicals that they claim do a better job, for which they charge a much higher price of course. Often the end result is not better than vinegar achieves.