I have an TTR 600 (similar model) and similar challenge with getting into neutral sometimes. A simple thing you can try that both helps practically and might be a clue to root cause of problem is that it is much easier if you rev engine when u try to get into neutral.
For me it has become a habit to crank the revs up a little while trying to get to neutral. Usually it works pretty well with just a well timed gentle twist.
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