I'll second earning more, while not increasing your expenses.
Another thing, from someone much nearer the start than the end: Don't worry too much about the magic number you'll need at this point. Your current spending levels may be drastically different than they will be in 10 years, and that's okay. Do the best you can every year saving and try to not willfully increase your spending (unless it genuinely increases your happiness), and then when you get closer to 25x or 33x or whatever take a closer look over the past few years of spending. This helps me stay focused on things I can control and deal with things I can't much easier (health, market returns, laws). When I talk to people in my life who give the typical "oh no" concern about "retiring in 10 years" I like to remind them, and myself, that this is just a goal - I'm not signing a 10 year contract and leaving afterwards no matter what. That'll mitigate any disappointment if things do come up and help you focus on your happiness, the most important thing in this equation.
Also, I think you should do some reading and continue to learn, especially as things change. In highschool I got a 95% on the final exam in Econ the first day of class - the teacher said anyone who got a 100% could have the whole semester off. I thought I was an expert. After reading online in blogs for 3 months I thought I was an expert. Two years of learning, reading, and talking to people later, I realize how little I know now let alone in highschool. Take the lessons in stride and try to learn them without losing money to do so as often as you can - 6 months of reading about real estate and home ownership while renting is a lot cheaper than losing $10,000 in unnecessary transaction costs of buying and selling your first home in a two year time period.
If you do all this don't forget to not sweat the small stuff. You're going to make mistakes and have setbacks like everyone else in this world, financially and otherwise. But I can tell you from experience that it's way better to have the shittiest things happen to you and come home and relax than it is to come home and worry about how you're going to pay rent next month - - - - - - - no matter what. Good luck!