From reading your post, I think you may be judging yourself a little harshly. When you've reached a high level, it often seems that you're not making any progress because it's much harder to measure and see. It's easy when you're at a lower level- you don't know, say the past tense, and then you learn it. ASt higher levels, iot's more about fine-tuning and that's harder to measure or see.
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