Excellent question. But answer really depends on what’s your definition for success is.
I will make some general suggestions –
1) Improve your skills and especially communication skills. You should be able to express your ideas and thoughts to anyone and everyone. If I can’t understand what you you have to say, I can’t help/work with you. Lots of free resources are available online, start here – http://www.mindtools.com/page8.html
2) Always take care of your health. Daily physical exercises, good food and breathing exercises will really help with this.
3) Meditation – Find some time for meditation and let go of everything. You’ll be surprise that these few moments will prove to be very productive and relaxing.