I am by no means an AJAX expert, I have only ever used for pretty much what you are needing it for. It can be quite a lengthy explanation for a forum post. But when I was trying to achieve the same thing the first time, I found this excellent YouTube video series (5 parts) by Brandon Brotsky on how to filter custom post types using AJAX. Even if your only filtering regular posts and not using ACF, you should be able to use his method to filter posts by date or title in ASC or DESC order. Actually it should be easier than what he is doing in his video.
https://www.youtube.com/watch?v=e5tUkHczcVE
I know it’s probably not the answer you were hoping for, but I think you will find his video helpful to some extent.
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