I thought I said why in my first post.
It is obvious that it did NOT work. Having only one toon (by deleting other toons) won't make u focus on that toon. So stop deleting.
There are only 16 advance classes. Half are mirrored in skills and half have the same class story. So keep 12 toons and pick the one you particularly feel like play for the week. Yes I say a week; make a commitment to stick to one for a week. So you can make some progress. Then feel free to move on to another one the next week.