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As long as your goal has these qualities, it's a great one for you:

  1. Has a specific end date (end of 2018)
  2. Has a specific achievement (400-500 SP is a tangible number)
  3. Is outside your current reach, but something you can stretch yourself in order to achieve (I can't be sure if this point is true for your goal, but you'll know for yourself if it is! Make sure your goal is hard enough that you have to work to achieve it, but not so hard that it is completely unrealistic!)

Maybe that's the difference between a successful person and an average one. Successful people do work harder to get ahead of others. They say if your dreams don't scare you, then they are not big enough.
Your 3rd point kind of motivated me. Thank you.