Google frequently updating algorithm to improve performance and that is why there are lots of website panelize by latest algorithm and down their keywords ranking so how do you recover keyword ranking? And escape from algorithm updates. Following are the tips to escape from down ranking.

•   Don't use any hidden text or hidden links
•   Don't use clocking any other black hat page redirection technique
•   Keyword stuffing – don't use excessive keywords
•   Don't' use duplicate content

Other than this keep variation in your anchor text and dont use parked domain

Don't hit your site for traffic purpose from your own IP and ignore Black and gray hat SEO you can recover your ranking.

Right, those hit by penguin must follow these guidelines.

Google Penguin Specially hurts low quality and spam link building strategies. It really ruins visibility of that site who really use these spam activities. So, never use any spam activities for your site. If your site is affected from the same algorithm, you should have to put your poor backlinks (which comes from low page ranked and irrelevant sources) into disavow tool.