I think there is no specific count for adding keyword in a content. We need to check the keyword density and maintain to 1% - 1.5%.
For example, if a blog post contains 500 words, we can add 4 keyword in the post.
So a blog post with 1000 words, we can add 8 keyword in it.
I conclude, adding keywords in content depends on the total number of words in post
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