COMMIT EVERY DAY
I've lost count of the number of times of I've started a creative project and not seen it through to completion or had ideas for one and not gone further than there.
These days though, this rarely happens. When I think back to why this happened so much it's usually because of the following reason:
I didn't commit every day!
DON'T MAKE GIVING UP A HABIT
How often have you began reading a book, got to around page 75 and then stopped reading for a day or two?
If you've ever done this (and you're like me), you'll probably find that you didn't pick it up for a long time or simply quit at it all together. Even though it was only for a short amount of time, you lost the daily habit and getting back to it can seem like an arduous task.
In your creativity, remember to work at something EVERY DAY, no matter how long for.
Does this mean you can't take a break from your creativity? Of course not. But, make sure that any time you take off is scheduled time. Deciding on a whim to not do something because of laziness or a "can't be bothered to" attitude is destructive - it will lead to bad habits.
Giving up will become a habit.
A small amount of time is better than no time at all.