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
It's actually a funny paradox because one can become the richest person in the world if one travels back in time, but to spend money even on detailed research on the possibility of the time machine one kind of already needs to be among the richest people in the world

Seriously, though, 2013 was a great time, but we keep forgetting that it did not seem great back then, which means that now is probably also a great time to invest, but we are just being greedy, looking to the way things used to cost and missing the opportunity.