How about "numerous?" Though you can go overboard there, too, and get flagged. But I usually have a dozen or so keywords, as every relevant point is an opportunity to draw in a reader.
I do try to avoid annoying keyword calls, though--I don't want to annoy a reader by luring them to my Hub on selling my house--alert: made up example; I don't have such a Hub!--just because I mentioned the resident cat in paragraph 3 and then foolishly put 'cat' as a keyword. In other words, I try to keep it reasonably relevant to the best of my ability. (I recognize, however, that you can't anticipate every eventuality.)