It's tough feeling stuck isn't it?
The only peice of advice I can give is perhaps you should set it aside for a time? Keep the intention of finding your purpose but, just relax. I did this and after a month or so found the right words.
I've heard it said for writers that they need to stop for at least 2 weeks before coming back in order to be able to objectively look at their own work. Probably isn't worth trying though, is it?
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