When you adopt the habit of repetition, the thing that you persist in will be overwhelmed by the growing, invisible, silent skill you are fine tuning.
So I suggest you develop the mindset of resilience.
What you did not understand today, rest a while, and you will surely master tomorrow.
Because it is through your ability to go at it one more time, day in and day out, that you WILL become successful.
What you need, your bridge to get you from where you are to where you want to be, is skill.
And you can have this through repetition.
"Repetition is the mother of all skill." - Tony Robbins.