There may be a lot of competition these days but, along with it, comes opportunities for massive success. As self-made millionaire Steve Siebold said, "In a free-market economy, anyone can make as much money as they want."

Business Insider shared 11 tips from business people on how to be successful. These habits came from self-made millionaires who achieved the status by 30 years old.

1. Focus on earning more. There are always more ways to earn. Motivational speaker and author Grant Cardone said that there's no way to save up to become a millionaire these days - it's important to focus on increasing one's income.

2. Find other ways to earn. Additional streams of income can be from real estate rentals, stock market investments as well as part-ownership in a side business.

3. Save to invest. Instead of saving just for the sake of saving, set money aside which can be used to invest in the future.

4. Stand on your decisions. It was noted that highly-successful business people have the habit of being able to reach a decision promptly.

5. Learn when to splurge and when to tighten the belt. Cardone added that he only bought his first luxury watch or car when his businesses and investments produced a steady flow of income.

6. Develop a mature mindset about money. Know that becoming wealthy is in your control, as a result of your hard work and perseverance.

7. Continue to improve. According to managing director Tucker Hughes, the best investment that he has ever made is in his future. He urges leaders to read, listen to relevant podcasts and find a good mentor.

8. Opt for self-employment. "The great ones know self-employment is the fastest road to wealth," Steve Siebold wrote.

9. Know your goals. Create a clear goal and plan accordingly. Commit to attaining wealth.

10. Surround yourself with people you admire. Build relationships and network with people who share the same vision as you.

11. Think big. Cardone noted that there are "a shortage of people thinking big enough." Don't just settle for a million, shoot for $10 million or more.