I didn't read the OP, but I'll ramble on about inner peace for a second anyway.
I think the only way to have inner peace is to accept reality, and not to get caught up on the ways you wish the world was. I am going to die one day, and I believe that will be the end of me. I've accepted that, that is my reality. It doesn't hinder my inner peace, though, it strengthens it.
Before I could truly accept it I had to keep telling myself stories about how I'd live forever somehow in some magical utopia where all my dreams would come true. But there was always some doubt in the back of my mind, something telling me these stories I told myself were just delusions to shield my fragile mind from the harsh reality. So one day I decided to tackle this "harsh" reality head on, for myself. If I stop existing I won't be aware of it, anymore than I was aware before I was born. All I will ever know is what it is like to be alive, and I think that's good enough for me. Shouldn't I just be happy to of existed at all? Most potential human beings never even get this far, they never experienced existance.
I think the only way to find inner peace is to accept that one day you won't exist, and be fine with it.