Both my own experience and the guidance in the SAFe framework tells the same story on this topic. Before you start improving your delivery using a lean/agile approach, it is essential to stop and identify how value moves in the organization and really what the word value actually means for your context and customer.
I have used the Value Stream Identification workshop that SAFe recommends many times to do just this and have achieved excellent results with it, but I have also had many mistakes/learnings using it. So, I decided to condense my experience into a meetup & workshop to share it with more people, and it is now available as a video here:
The slides used are available here:
If you would like to learn more about value stream identification or even become certified in doing it, I suggest you attend on of my upcoming courses that you can find below here in the blog: