I told him instead sell the little you had and take profits at 73k and wait for the market to drop so that you could buy more cheaper, he said that we won't see $60k+ again, I told him to calm down and watch the market if we don't go back to within 60k.
Currently right away as I am creating this post, bitcoin is 67k from 73k.
If it was you would sell at 73k and buy back at this price now?
If your friend was trading short term, he should have sold at that price, and should not have waited for $80k because being 100% confident is where we traders losses most of our money, even if the trade looks wiining and you are 100% sure, it will follow your pattern, still never trust it, always prepare for the worst part too, like a backup plan.
Selling some at $73k would be a good idea, and then buying back at $67k is an obvious entry but I am sure if he was not selling at $73k as a short term trader, he would not have bought at $67k too. Because that's how new traders learn their lessons. $80k is a huge resistance for bitcoin, and maybe by the end of this month, bitcoin could hit $80k but chances are really low.