To answer your question about winning B3, the magical formula is to pile up enormous amount of cash. It has been done in the past by some micronation teams, example Iran's Venomous Scorpions. He collected cash for ten seasons or so, then made a huge payroll roster, which was maintainable for 1 season. He repeated the process twice so far.
But after they introduced the over-extension tax, it has become almost impossible. The new thing is similar, pile up cash, but instead of buying huge salary players, you need to buy huge value salary efficient players.
Also, take notice that this method doesn't necessarily work, example San Lorenzo something few season ago, and hopelessly addicted this season. But it does give you a chance.