There are a few ways to hit the ball longer: 1) Get more upright. The best way to teach yourself to get upright is to place a ball under your back armpit and then make sure to drop it at the top of your backswing. Getting more upright creates a bigger arch, longer swing, more whip. 2). When you get the swing to the top rotate your hips as fast as you can too through the ball. I know people who've gone to $1500 a weekend golf camp to learn to do it. That's crazy! Especially, when you can do it yourself. Another way is to work out and stretch. A great exercise to do to increase your rotation is to get a 5lbs. ball and throw it toward the target. Best if you have at least two people. This exercise will naturally help you rotate through the ball. Good luck,
On the topic of Youtube videos: Stop watching Youtube videos on how to learn golf. Don’t be a putz. They are more about self-promotion than anything. If anyone tells you anything different they are a liar. By the way, you might want to check out my video: https://www.youtube.com/user/GolfGuru1961