We will never be always motivated; so we can't be "a little disciplined."
You never "almost" ride a bike.
Navy SEALs don't "sort of" get through Hell week training.
No one is "more-or-less" on time.
A predator doesn't "just about" assault someone.
Gaining back all the weight lost doesn't mean the program was "pretty" successful.
There is. And there isn't. There exists do. And there exists don't.
Five days of adherence followed by two days of chaos is not "kinda disciplined." Six weeks of rigor followed by one day of torpor is not "almost" anything. Either that day off was part of disciplined plan or it was lack of plan.
I have been waking up between 2:45 and 4:30am for 15 years. And I'm not a morning person. It started as part of my job. And it became part of how I dominate a day, week, month, year, or life. It couldn't have been a "part of the time" proposition when I was getting accolade for highest performing trainer, coach, director, etc. in the country at large companies or in my own independent ventures. Discipline is simply consistency. And consistency is simply ALL THE TIME.
For the forthcoming New Year, you need discipline EVERY DAY. So pick behaviors and endeavors you WILL DO every day. Will you perform a two hour workout every day? Then don't make that a goal. Will you eat zero carbs every day? Then don't make that a goal. Part of being disciplined is being honest and realistic. What WILL YOU DO every day? THAT will be your discipline.