In my previous life I was the ultimate creator: there was nothing I couldn't do, no problem I couldn't solve, no goal I couldn't accomplish. I had everything you could possibly imagine. Power, influence, money. But, like with all things, after a while I got bored.
While contemplating my life and sad existence, a genie appeared and granted me one wish. "Everything that can be done, has been done. There's nothing for me to create." I said.
The genie replied "You need a challenge".
"I've met all challenges and conquered them. I don't think that will help".
"Well, then. I'll give you the ultimate challenge" the genie pronounced.
With renewed excitement, I accepted it as my wish.
The genie clapped their hands and I found myself in my new life.
This new life is the one I've always known and remembered. My old life is just a dream, barely a memory.
My new life is much more exciting. There are an infinite number of challenges waiting for me.