I think their question is more about motivation not how.  The age old motivator is $¥$¥$¥!!!!  I'm pretty lazy so after I decided I was going to write the JLPT the motivation came to crack down and keep up with the learning.  If you live far away from a testing centre it means you will have to pay lots of money to travel and write the test.  A good motivator to not throw away the opportunity.
I think another motivator is ambiance.  If you want to learn to play an piano you are constantly reminded of it ever time you hear a catchy tune that you think could work on the piano.  For languages it means either you have to have some penpals or enjoy japanese media.  I for one have found that I really enjoy j-dramas.  

  So they are always reminding me I should be studying more.
In addition I'll probably get some people angry at me saying this but I'm one for jumping around based on interest.  I think learning hiragana is good so you can easily look up kanji words when presented with the furigana but there was no way I was going to spend another month memorizing katakana.  I skipped it and came back it later.  If you get bored with one topic move to something else.  I would spend time trying to pick a part the audio blogs where they are decades beyond my level but I needed a break from the regular routine of newbie lessons.
Good luck.
 
