Practice. There are some very good books and courses on reading as well. The ideal situation is to have a very patient and experienced reading coach. There is also a huge difference between reading for comprehension of texts and technical material and reading for enjoyment, doing each well requires a slightly different process and techniques.
You may also still be reading each individual word. After either substantial practice or training, you can reach the level where your mind largely skips over the less significant words, and also where you read word groups rather than individual words. Once you reach that level, reading really flies.
I have both taken classes and had lots of practice, and my reading rate is very fast. When I am reading material for enjoyment, I find that I am reading at a rate where I “feel” the material rather than actually process each individual word. This is difficult to describe for someone who hasn’t experienced it. An analogy would be any of the martial arts or many sports where you reach a level where you no longer think about any individual move, your body merely senses and instinctively responds to the needs of the moment. It is sometimes referred to as being “in the zone.” For instance, I might read a long descriptive passage about a setting. If I immediately was asked to repeat some of the adjectives and adverbs that are in the description, I would not be able to repeat the same words as the author wrote. I would, however, be able to give you a pretty good paraphrased description, because rather than reading individual words, the words were somewhat unconsciously absorbed and created a mental picture, then I memorized the picture.
I do the same when acting. I do not memorize my lines. When I have done that, my acting suffers and sounds like recitation. I practice repeatedly with other actors, and also repeatedly run the lines and scene by myself, out loud and in my head, until I have not memorized the lines, but rather the character’s thoughts in response to that situation. When I then encounter the situation again during a performance, it triggers the same thoughts, and the words of the lines have been linked to those thoughts in my memory, and thus flow naturally in response to the situation, rather than my simply reciting them. It is a difficult distinction to describe, but it works for me.
This is all very difficult to do intentionally, you have to practice the techniques over and over until it becomes instinctual, just like any sport.