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Which frontend are you using to post? Word lengths shouldn't be a problem as I've seen posts a 2000-3000 words long before. I suggest you hop on the peakd or Hive discord channels to ask.

PeakD. I think the limit is triggered by the length of the post (how many lines it occupies) not the number of words or pictures/videos attached. I had to cut half of the text, a few videos and many pictures. Such a pity it doesn't give you a warning before you press the button. Since it saves the draft automatically there should be a notification if the saved one is too long. Thanks.