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despite the quality

Perhaps they are not as good as you think? You should try reaching out to one of the steemSTEM mentors for guidance ( on the steemstem discord) . They will help you grow!

Your content may be good but you were not active on discord. Relate more :)

Good contents hardly go unnoticed, authors active on discord or not. Perhaps he just thinks his contents are good but might not really scratch the standards of steemstem