Along with the several other things you do while you set up your disc golf shot, focusing on your target is going to help improve your accuracy. There is a lot to think about like your footwork, angle of release, proper pull through etc. but that’s why this game requires so much practice. Focusing on where you want your disc to go for at least a few seconds before you throw is going to give you increased consistency.
When you are throwing short putts you already know to focus on a single link or some other specific point on the target. There is not much movement in your body and you can keep your eyes focused on your target the entire time. This is why short putts should be your most consistent shot.
As you get further away, say outside of the circle, you may not be focusing on a single point on the target anymore. Your disc will need to go higher to reach the goal and maybe even need to fade in depending on your style. In these cases it is good to focus on the point your disc needs to go. If you are throwing a hyzer putt you should focus on the point where the disc will fade hard into the goal. If you throw this same shot and focus on the basket you may miss left (for RHBH).
Upshots and Midrange
For many upshots and midrange throws you may not even be able to see the target. In this scenario you should also focus on a spot you want your disc to pass through. During an upshot you will have a longer reach back than a putt. Your body will be sideways to the target but you can still keep your eyes down range focusing on that point.
Before reaching back for your shot you should focus on your spot for 2 seconds and not take your eyes off of it as you go into your routine. You will a lot of players do this and many do not need a step or X step to achieve midrange shots.
For drives where you have a long set up and reach back you will not be able to keep your eyes down range the entire time. These shots are made through memory. Focus on the spot you intend your disc to go. Line up your angle of release for that spot and then go into your routine. Your brain will do the rest from memory and proper alignment of your feet.
By the time you enter your run up the outcome of your shot has been determined (unless you trip). You have lined up your shot, you have focused on a spot for the disc to go and now it doesn’t matter if your eyes are looking down range or not. If your form is consistent you should be accurate.
When you are throwing shots where you do not move your feet as much it is a good idea to keep your eyes focused down range so you don’t look at other things like your body or background movement.
For short putts and throws you should focus on a spot on your target, as you move further away this may not be possible or the best option. Focus on a spot according to the flight of your disc and make sure that if you hit that spot the disc will land where you want it to. For longer shots where you take your eyes off the target, focus in your spot for a few seconds before you enter your routine. This will commit the spot to memory and ensure your disc flies in the right direction.