Percentage unmoved for three weeks.
I'm not normally one to worry too much about gamification tricks, but this one has me puzzled. I'm regularly hitting 100 points a day now, and I am only 5 lessons from finishing everything in the French category... with no lessons in need of strengthening.... and yet, my percentage has stayed put at 56 percent for about three weeks. Any clues about how this works?
Try putting it under troubleshooting. People who know how this works will answer your question.
My experience is that it slows down or stops somewhere in the 50-60 something percent range depending on the language. That's around the max that anyone gets. If you are still learning, continue practicing your tree anyway. Try the skill strength viewer 3rd party script. Not only will it give you a 100% average range of all skills, you get a percent for each skill. I find that far more motivating than the fluency rating, especially when you are done with the tree or near the end.