I made a post on this on “Share Your Work” to what I did but I will reiterate it for what I found very helpful/successful Original
- Spend 1-2hrs a day on mini projects that I can get deep into for a month or two at most.
- Look over the source code and notebooks often
- Write blogs and lecturing geared towards those who either barely know what fastai is or are getting the basics to make sure I know it well enough and can explain it.
- Go through the lectures and courses slowly, relistening and running the notebooks often .
- You are your own rival. Try to outperform yourself on your projects and you will see growth.
- Read the forum daily. Even a casual browse of a topic. I may not understand something people are talking about, but I know it exists and I can revisit it later if I need to
Essentially go through the notebooks and explore why what is doing what, play around with problem sets, and keep looking back at the original notebooks until it becomes fluid 
Hope that helps!