Submission massivly rejected

The technical reasons or duplicates are abusive.

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Not sure what that means.  🙄

The selection criteria hasn't changed much. But equipment has improved a lot.  We're no longer shooting with 12-16 megapixel cameras.  We're using 30+ megapixel cameras. 

Contributors have improved their skills, too.  The quality of work submitted to Stock is better now than it was 2-5 years ago. 

All things being equal, your competition has gotten better and maybe you've stayed the same.  It's time to spice things up. Get a new camera.  Or get 1 or 2 new lenses to play with.  Experiment with different subjects & scenary.  Stroll through second hand shops and antique stores on the hunt for interesting props you can use to add interest to your photo shoots.  Look for things with unique textures and colors.  A rusty wheelbarrow or worn out window frame.  Whatever suits you.  And then get busy taking more photographs.

Remember Stock is a business like any other.  It's constantly changing.  Trends shift.  People's tastes change.  Keeping your portfolio fresh with new & diverse content is key to more sales.  If your acceptance rate has dropped to 35%, examine your work more closely and compare it with other Stock inventory in the same keyword categories.  Select only your best work.  It it isn't as good or better than what's  represented, don't submit it.  That will reduce your rejection rate.

Hope that helps.

Please share 2-3 pictures (ORIGINAL not reduced) with the rejection reason for each one. The fellow contributors here may have some tips to share, or observations that you missed.