Re: imagine that you have a travel machine that get you back to the 2013
what would be the first thing to do and how to buy bitcoin where to hold which currency want to get and how do you plan to do that 
LOL I would spend every single fiat I had into BTC and would never sell them. I would not spend much in luxury, I would loan money from the bank, from the relatives, from friends, from possibly everywhere and loan from others. I would promise them better return than bank of their money they gave me. Once BTC would hit it's ATH (~$19k) I would sell them all and cashed out. I would repay all the loan and with the rest I would buy when price are down and sell when price at the pick every time.
Not to mention, I would again spend all my cash to buy BTC when the price was $3,200 few months ago.
Back when the year for bitcoin was too bad. The years that passed in bitcoin that ignored by the people. That time, I was on the computer playing online games. Haha. I thought before on how to make money online. I wished that I had my perseverance before to know the online money income. If I had to comeback, I am a millionaire right now.