When you're not progressing as quickly as you'd like, there are many components to examine.
Time - Are you putting in time in every day to improve and master your skill?
What - What exactly are you doing when you practice? How are you going about improving your skills? Can you try something different?
Why - Why are you doing this in the first place? Do you need to be re-inspired?
Who - Who are your teachers and role models? Whether you have a teacher or not, there are others who have come before you. What do they have to say? What can you learn from them?
I'm sure you can come up with other aspects to examine.
By dismantling the problem, you find the bottlenecks.
By dismantling the problem, your work becomes more interesting.
By dismantling the problem, you not only figure out the way forward. But you also learn a whole lot about yourself.