It's already been said, but I'll underscore the point:
1. Gradually increase your yardage to a decent amount (don't expect much serious improvement on less than 15K yards per week; double that amount and you'll be swimming much faster; triple it and hold it there for 2-3 years and you'll be swimming with the FOP) .
2. Swim harder 1-2x (repeats, longer hard sets, TTs, get a coach to help you with a structure) per week once you can handle the yardage.
You will likely "find" the technique improvements on your own as you swim more, especially if you are an attentive swimmer. And if you hit a wall and can't improve, you'll need to do even more and even harder swimming, and have a qualified coach look at your stroke and see what kind of tweaks can be made for further improvement. This process goes on ad infinitum. More swimming, more technique tweaks, more swimming, etc.
Really want to improve? In the off-season, do a 12-16 week swim focus (with big yardage, 40+K a week) and you'll see huge improvements. Guaranteed. If you want to make a breakthrough in swimming, at some point you are going to have smack some serious yardage. There is no other way. Anyone who tells you that you can get down to long swims at 1:20/100meter pace from where you're at with just technique tweaks is lying.
Best of luck!
1. Gradually increase your yardage to a decent amount (don't expect much serious improvement on less than 15K yards per week; double that amount and you'll be swimming much faster; triple it and hold it there for 2-3 years and you'll be swimming with the FOP) .
2. Swim harder 1-2x (repeats, longer hard sets, TTs, get a coach to help you with a structure) per week once you can handle the yardage.
You will likely "find" the technique improvements on your own as you swim more, especially if you are an attentive swimmer. And if you hit a wall and can't improve, you'll need to do even more and even harder swimming, and have a qualified coach look at your stroke and see what kind of tweaks can be made for further improvement. This process goes on ad infinitum. More swimming, more technique tweaks, more swimming, etc.
Really want to improve? In the off-season, do a 12-16 week swim focus (with big yardage, 40+K a week) and you'll see huge improvements. Guaranteed. If you want to make a breakthrough in swimming, at some point you are going to have smack some serious yardage. There is no other way. Anyone who tells you that you can get down to long swims at 1:20/100meter pace from where you're at with just technique tweaks is lying.
Best of luck!