Regarding getting more of your readings in target, this really depends on what trends you are seeing.
If you are always high, you may need to increase your basal.
You can do a basal test overnight by checking what your readings do when you are asleep - if they are flat, you probably have the right amount of basal; if they rise, you could increase your basal; and, if they call you could reduce your basal).
Once you are confident with your basal insulin, it is time to review your bolus.
This may vary at different times of the day.
So try it - eat your breakfast with your usual insulin and see what happens with your levels.
If they return to your pre-breakfast levels, you have the correct dose for that time of the day.
If not, you could tweak your bolus.
Then repeat for other meals/times of the day.
You may also want to review your correction dose in the same way.
Again, this may vary at different times of the day.
Confusingly, this may also vary depending on your Bg level; it is common to become temporarily insulin resistant when your Bg is high and need more insulin to correct.
Another thing to consider is what impact various activities have.
If you exercise regularly, you can watch what happens to your BG when you are running (or whatever exercise you do).
You may see a large drop which you will need to manage.
Finally, you may want to review your Libre readings to decide whether to bolus earlier.
This may depend on what you eat.
But, as simply as possible, consider your insulin working at a fixed rate and your food converting to blood glucose at a different rate. You want to time your insulin dose so the peak of your insulin matches the peak of your BG conversion.
Different foods will convert at different rates so your insulin timing is likely to vary.
Eating less carbs may make this easier to detect and react and harder to make mistakes.
However, as
@Knikki suggests, it is easy to get hung up on the numbers and let them take over your life.
To me, managing diabetes is a matter of balance - balance of carbs and insulin but also a balance of "normal life" and "diabetes life."
Also, don't believe everything the Libre tells you.
It is great for detecting trends but it is not considered as accurate as pricking your finger.
Some people get very accurate results from Libre - other's don't.
And it is less accurate when high or low.