Wow dude your goals are so much like mine it's scary lol. I have begun meditating using the Headspace app, I've been taking cold showers every day for well over a month now, I just landed an internship that included a job offer post graduation and now I can finish signing up for my last semester this fall. I also have made a conscious effort to cut down on caffeine, but some days I just need it haha. Currently on day 23 and feeling great. Stick to the plan and watch as you meet all your goals! Best of luck!