You can check "collect keywords from target sites" and see what kind of keywords it collects. Most will be unrelated to your niche and that's why its not recommended to check that option.
"always use keywords" is only recommended for niche related platforms like blog comments. with that option checked you will have problems to find article directories for example because there aren't that much niche specific directories in general.
i suggest to leave it unchecked or split your projects to gain more control over your settings.
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