I don’t think we can use tattoo etc… because I believe all the environment/reality, the body & memories will also back to the beginning stage of that event.
Well "I" can’t send the messages to myself, I don’t know how to record it and avoid losing it. But maybe I can drive myself into a fatal position and then come out alive!?
I will go insane and create a big disaster/event, the more involved people, the better chance in the result(the greater the unity, the greater the strength). because of the future consequences...…I hope the time travellers will come back to stop me/forward the messages and change my past(their past), create another parallel universe... haha I know this is a terrible idea but maybe it is another way to break the loop and send messages to the past?
I mean, maybe I am in the loop that I can not inform myself directly, or maybe I am keep creating new timelines, reaching the similar outcome and too late to change anything. But other people are still continue living in their universes with infinite possibility, so with their help I will be able to pass the messages to another "me" from parallel universes and change the past eventually.