What the score actually means
A score under 60 means your content is missing critical topics or signals — it likely won't rank no matter how good the writing is. 60-79 means you're competitive but not optimized. 80+ means you've covered what Google expects and have a real shot at ranking.
Don't chase 100. Past about 85, you're optimizing for an algorithm at the expense of readability. The best-ranking content scores 80-90, not 100.