I can not recommend the Yale course on death by Shelly Kagan [1] (26 lectures of 45 minutes) enough, it is really extremely good. And I think about the first half of the course is about identity and all the things like souls that could play into this.
I did not mention this topic, because I think it is only secondary for free will in the sense I talk about in my comments, because I think the hard part is already finding anything at all that could affect your choices. Only when you have identified something that fits the requirements, say a god, and the whole thing is consistent, only then you have to worry whether you want to consider that thing part of you. That might be easy if the answer is everyone has its own soul or it might be harder, that is why I choose a god as the example, because some might argue that a god is a separate entity while others might argue a god is part of all of us. I added a lengthy comment to the parent one going into more detail why I think finding anything that could possibly work is already hard.
I did not mention this topic, because I think it is only secondary for free will in the sense I talk about in my comments, because I think the hard part is already finding anything at all that could affect your choices. Only when you have identified something that fits the requirements, say a god, and the whole thing is consistent, only then you have to worry whether you want to consider that thing part of you. That might be easy if the answer is everyone has its own soul or it might be harder, that is why I choose a god as the example, because some might argue that a god is a separate entity while others might argue a god is part of all of us. I added a lengthy comment to the parent one going into more detail why I think finding anything that could possibly work is already hard.
[1] https://www.youtube.com/playlist?list=PLEA18FAF1AD9047B0