Hi, Alessio - welcome to the forum. This is a good place to process these kinds of questions. Here is my own take on some of what you bring up.
This very way of thinking of the situation still betrays a fairly firm modernist mindset that a lot of ex-YECs struggle (or not!) to shed even while they are still emerging from that belief system. In short it might be characterized this way: “we now know that significant parts of the Bible must merely be myth (meaning ‘untrue’), and so now the project becomes a sorting to cull away the ‘untrue’ from the ‘true’ according to our new scientific lights - in a kind of triage to hopefully rescue the parts that can still be respectably defended in modern contexts.”
I won’t presume to know for sure how well that may fit your experience - I’m only guessing based on your introductory post here, of course. Many of us as believers here think of the Bible as true in all that it teaches from the first verse. We just don’t think that modern approaches such as what YEC has adopted (where science and historicity are uncritically granted status as the truth gatekeepers) … we don’t accept that this is a true or faithful approach to the Bible as a whole, whether it be passages in Genesis 1-11, or later, or in the gospels. There are places, of course, where historicity is an important consideration, but we generally like to get that clue from the text itself and not as a modern demand imposed generally on the text from without.
This is my initial reaction - sorry if it goes wide of the mark of what you’re looking for. But feel free to jump in with clarification or push back as needed.
And again - good to have new voices like yours here!