Validate yourself for who you are as an eternal spirit who has lived many lifetimes. I was samurai twice 250 years apart. An archer and swordsman. I was a cave man at the dawn of time staring down at an ice field looking for game. I was tortured and beheaded by zealots.
Over my lifetimes I come to learn many things as a spirit, and I still have much to learn. So what period of time calls to you?
Do you have a fascination with a period of history? Do you read books about it, or listen to music of that time? Do you imagine what it would be like to live back then? Do you visit places that have historical spots related to that period of time?
Just look within and notice what comes up for you.