If you're churning out 6 songs per month, then I wouldn't say you have a lyric writing flaw!
I struggle to write a song a month, and I wouldn't say it's a flaw. It's just really difficult.
But as for suggestions, I would say reading is excellent for bringing new ideas, stories, moods and images into the mind. Also, do something different, outside of your normal routine. Go somewhere new, speak to an old friend you've lost touch with, learn a new skill. All of these things will find their way into your songwriting, whether you're aware of it or not.
One last thing: read the lyrics from the best songwriters - always a good one.
Good luck