I have found these answers thru seasoned pro's, instructors, hunters, target shooters and simply great shooters that I admire. I preface this with simply "do what works for you" and also accurate precise shooting is all in the view of the shooter and their needs and/or desire. For some, a grouping into a 2" circle at 20 to 25 yards is good enough.  For me, if I'm not stuffing an arrow into a quarter sized circle or smaller... I keep practicing. 

1. What is the best way to increase your accuracy as an Archer?  Find, thru experience what works for you. Use established known skills to make yourself consistent. i.e. Consistent hand grip that's loose yet solid in your palm. Find a consistent anchor point to draw to... and I mean consistent, perfect every time. Use matched equipment, arrows that match your bow and the same type and weight. 

2. What the best way to get better once question 1 is found? Simple, Practice and more Practice! Shoot 3 to 4 days a weeks at least an hour each time. Shoot everyday if you can. Pro target shooters practice more than 20 hours a week. Exercise the muscles you use in archery... they're easy to identify. They are the ones that ache or get tired first. Oh, and did I mention, Practice!

3. Should I shoot at one spot or many targets?  You'll see many pictures or people shooting a dozen arrows into one 2" circle. This simply damages arrows (good arrows are expensive) and trains your mind to shoot well at one spot. Real life is not like this... in a hunt, you get only get one shot in most every case, you best hit it the first try. In target shooting, you get one shot, with one arrow for each target circle, no second tries to get it the middle. 

Train yourself to shoot at many targets. Hit one and move to the next. Retrieve your arrows and start again. This forces you to refocus on each shot, to truly aim and hit your target, not just rely on reflex... but shooting skill!

Almost anyone that shoots well enough with acquired skills will eventually shoot a "Robin hood" (arrow into the end of another arrow) out of shear luck if shooting at one spot long enough. Other than a item of interest you can tell a story about... you just wasted two good arrows and money to replace them. Don't try this on purpose. Spend the money on a new bow or new gear.

If you have a question for IPA Archery, email me. I'll do my best to answer or at least send you the right direction to someone who can. If you don't like my answers, I always like a good debate... but again, it's my opinion.