If is guarented that I would listen, then I would say; prepare for cancer, do gym, buy bitcoin.
My life has gone from normal to absolutley hell in a single day and with those 3 words Im sure I could avoid that day, and avoinding that everything would be different.
All the winsdom I have today is built from sorrow, anger, regret all kinda of negative emotions, I have nothing to pass for a younger me that would cause any good other than the above metioned.