I can argue either way that swing speed results in longer drives. But I also can argue that ball compression, or solidness of hit is equally or even more important to maximize distance. But I'm not going to. I'm going to take a twist and talk about something different than both of these topics.
How about slicing the ball? What is happening to cause this? Most likely it's your upper body coming over the top on the downswing resulting in side spin on the ball. I look at that is a physical limitation in which your core flexibility is not good enough to have your swing start from the ground up, giving you an inside swing path coming down.
Your swing will quickly become more powerful. Your body will not hurt as much. Pain-free golf is coming your way. And, you'll be able to maintain energy, concentration and focus for the entire round. No more blow up holes in your game.
Those that played it for money was mostly betting on the game among themselves and maybe with a few other rich friends looking on, they were called professional golfers. Those that played the game for fun sometimes with each other and other times with the professional golfers, were called armature golfers.
If you take more lessons, hit more balls you can fix this fault. It won't happen. This most likely is a physical issue. Your body is not strong enough and flexible enough in specific muscles (hamstrings, glutes and lower back) to keep you down over the ball through impact.
The only way to improve this is to partake in a golf-specific exercise program targeting the muscles mentioned above. Like any other athlete, you must prepare your body to perform. This means really working on it during the golf offseason, and maintaining it through the season.
For example, in a group of four beginning golfers, if all four were about 150 yards from the hole, each player might hit a different club. Some might hit a wood and others an iron, depending on individual swing characteristics (i.e., how fast they swing the club and how accurate they are) and their preferences for using one club over another. In each case, though, a full swing motion would be applied.