How many keywords do you think you can put on a single page? The answer is hundreds if not thousands. But you are not going to be writing or creating pages based on 100 keywords. Instead, you are going to be creating pages around a group of terms or a topic.
Neil Patel's advice is to write for 3 to 4 key keywords and then you'll find a 2000 word article on the topic, if well-written, will also rank for other longtail keywords.