Huge problem with Hashtags

Hello,
My account has 30K followers. I follow/unfollow 450 accounts per day.
Every day in afternoon I publish a picture with 30hashtags.
Everything ok.It works.

If one day I change some of these hashtags, nobody of my hashtags work.
If I post the morning or the night the hashtags don't work again.
My picture is not visible on hashtags section.
What happen?
All my pictures are mine.

What can I do? Iam really sad.

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