I agree with Autime's point that aim is mostly about reading, and disagree with ttheguy that you should be playing jump maps.
First, about jump maps. You should use these more as benchmarks to see how well you can aim, rather than use them as practice material. I don't touch any jump maps (and I generally avoid farm jump maps) but I would say my aim is pretty consistent and good for my rank.
Regarding reading: it's a good sign that your accuracy is high, which means you probably have decent reading skills (I don't know what maps your top scores are though, so they may be simple maps for all I know).
So I would like to know: what are the reasons you miss?
1. Is it mechanical, in that you see a circle and you move your cursor towards the circle but it's off?
2. Or are you not reading each individual circle separately and are instead aiming in the general direction using your peripheral vision?
3. Or do you not read ahead of the current circle, such that you are 'caught by surprise' by a jump and hence screw up your aim?
1. If it's the first issue, I would suggest to not read ahead of circles first, but to focus on the current circle and your cursor to make sure it goes to where you want it to go. This would help build the muscle memory of your hand moving your mouse to where your eyes looks at. Once you've mastered that then start reading ahead of the current circle, and your hand will move automatically to aim the current circle even if your eyes are no longer looking there.
2. If it's the second issue, I highly suggest you start learning to read individual circles. This is extremely important for snapping to the correct location, and will be very useful for more difficult maps in the future. For example, to play a sliderspam map, you have to read each slider individually and focus solely on the sliderhead. There's no quick fix to this, start with a simpler map and intentionally focus on individual circles.
3. If it's the third issue, then you have to learn how to read ahead. This assumes that you've mastered your aim such that your hand goes to where your eyes are looking at (i.e. the first issue). Reading ahead simply means focusing on the notes that are just appearing, rather than those whose approach circles are already closing in on the hitcircle. This means that by the time your hands move the cursor to the circle and tap to the beat, your brain should have had a good amount of time to process when and where that circle is. If you perfect this, the only thing that can surprise you is slider velocity changes, since everything else should have been read by you before you hit them. Again, you have to practice this with a simpler map.
Let me know what exactly your issue with aim is, because the above points are definitely not exhaustive. But they should be a good starting point for most people to improve their aim.