You have made more quilts than I have!! I agree with another poster. Take some classes esp if you feel that you struggle with certain aspects of quilting. (cutting,etc). Is your 1/4" seam "true" on your sewing machine? It made a HUGE difference in my quilting once I used Eleanor Burns method making sure the seam allowance is "true" vs relying on my 1/4" foot. (I am sure her technique is not unique...I just happened to have a book or 2 of hers.)
Make some smaller projects such as purses or other "non quilt" items. I find that I need a break once in a while so off I go into another sewing direction. It helps and it breaks up the monotony at times.
Don't be so hard on yourself. Go at your comfort level and don't "judge" yourself so critically. Sometimes we have to just say "it is what it is" and move on!
Good luck!
Sandy