Please do not buy on margin, if we are in bear market it can go down lot further. A better rule to buy crossing 5 EMA on daily chart. You might not buy at bottom but you 90% better off then trying to find bottom. It is a horrible situation. One better way to buy in this situation buying long calls say 10$ call for 9 months you will be risking limited amount but will get most upside if it break. Good luck and happy trading. Farooq