Be careful, just like before it couldn't stop going up, now the momentum changed and it can't stop going down. The bottom? nobody knows! I covered at the bottom all my shares but I'll be shorting any head fake on this still hypervalued piggy.
normally you want to wait for the stock to stop plummeting and form a base before buying. And whatever you do, don't interpret a one-day 20% gain as a reversal. A base is a week or more of not falling AND not jumping.