Petra Kvitova is out of TOP 10 in WTA rankings. There is no question about her making her way back into the TOP 10; I would say even TOP 5. She has what it takes to become world number one. Remember, she was close to achieving it almost five years ago.
Petra won Wimbledon twice, since 2011 at the end of the seasons; she was always in TOP 10 with at least 3500 points (not since February 2016). She has all sorts of tennis weapons, so it’s more than enough if two or three of her weapons work in a match against average WTA player.
She will never run a lot, but she can get her opponent under pressure with her powerful serve, which I would spend time working on even more to make it absolutely brilliant. She needs to be more active herself, be more aggressive. There is no tennis player, maybe apart of Serena, who can cope with her pressure.
Her offensive game is based on a lot of risk. If such player has a bad form, without enough concentration and motivation, close balls which used to end up in the court are outs or end up in the net. Then confidence drops. She is not motivated enough in my opinion. I heard she is aware what’s going on and that she only gets what she deserves for all the works she puts into tennis recently. All depends on her and I think she can very quickly find her game. She is world number one candidate.
It is a big difference to be a world legend like Djokovic, Serena or Graf, or a player, who wins one or two grand slam titles and is in TOP 10. No one will remember such player in twenty years. Question is, whether Petra is happy with her current position in the ranking. For Slovakian and Czech standards, she is already considered to be a hero and we will remember her in 10 years. If she is happy, she can play in the ranking between 5th and 20th place, make some money and job is done. Players like Federer have extra motivation, because they are part of tennis history. They make this history. Kvitova should follow similar path. She still got time, considering players over 30 win grand slams these days. There is time for her to make tennis history by herself.
She needs to sacrifice everything. Djokovic is the first to come on court in the morning and leaving last. He is the engine of the team. Petra is not working in this mode. She can also add those 20 minutes extra to her practice, make 150 more serves, wake up earlier and have a good stretching. She can go for a good massage in the evening instead of going to the cinema. If she started to solve these minor things, everything else would not be important and in 2-3 three years, she would be legend. She is capable of reaching these limits. I wish best of luck to Petra and her coach Frantisek Cermak.
Erik Csarnakovics used to coach Norbert Gombos as well as Jarmila Gajdosova, Kristina  Kucova and Jan Stancik. At the moment he is head coach and co-owner at LOVE 4 TENNIS Academy in Bratislava. He coaches also young Dominika Sujova and Viktoria Morvayova.