How do you become a better bolt rifle shooter

[JWCalgary]

OK, here's what I have been doing the past couple of years to get ready for hunting. My practice routine is as follows (all applicable calibers)

100m on a rest (bag or pack), 3 rounds, 3 minutes, sub MOA
100m prone or seated, 3 rounds, 3 minutes, within 4" circle
100m offhand-standing, 3 rounds, 3 minutes within 8" circle

200m on a rest (bag or pack) 3 rounds, 3 minutes, 4" circle
200m prone or seated, 3 rounds, 3 minutes, within 8" circle
200m offhand-standing, 3 rounds, 3 minutes within 12" circle

300m - on a rest, 3 rounds, 3 minutes, within 8" circle
300m prone or seated . . . not for me yet

My questions are as follows for your opinion to become a better shooter:

Would a "good" shooter use a smaller diam. target at the above ranges?

Would a "good" shooter do quick succession shooting like 3 rounds in a minute let's say? or conversely, expand it out to 5 or more minutes . ..

When you shoot off a rest do you use a rest with adjustments screws, etc to really dial it in or do you feel using a pack or bag is better in non-target style shooting

how do you do it? Anything else I should be trying in terms of practice?

thanks all