I am still short from above $14k when I lost my nerve (now glad I did) and I am still waiting for a good bottom to jump back into. I did pick a little bit up back when we were near $6k, but I am still waiting for the big "mother of all buys".
I trade a small amount in-between to keep from getting bored, but I don't think we have reached the real bottom quite yet. I could be wrong, but then again I have plenty of room to get back in again before I lose any money, or more correctly lose any Bitcoin.
I do not think we are going to see a price below 6000 you should have taken the opportunity to buy at that price, it was less than a third of the all time high that bitcoin reached just a few months ago however you could be right the price of bitcoin could go lower and you could buy even more bitcoin when it happens but you are taking a huge risk because if that doesn't happen and you don't have bitcoin when the price begins to grow you will lose a lot of money.
$6500 has been showing a good support so far and price had a nice recovery from that bottom, and although i don't like saying never when it comes to bitcoin but it seems like you are correct about it. we have already seen a HUGE drop from the ATH and that has to count for something.
as for buying the best strategy is to buy at least some amount in this dip so that you have not completely missed the chance and also not to go all in at the same time so that you still have some money left for possible lower prices.