The method of "grinding SoD SMS matches, shaking over the result of each game" is a road to nowhere, suitable only for those who have already reached the ceiling of their skill in Heroes and don’t want to lose their authority.
When you’re young (in the gaming sense), you need to learn, not throw your weight around. Play everything—random, fixed, SoD, Light, Full, and all the templates available in tournaments, experiment with rules, settings, and so on. The more you know, can do, and try, the broader your general Heroes horizon and the faster your path to the top.
And that top is by no means in the seasonal rules of HeroesWorld. The most representative tournaments (both online and club) take place precisely on XL+U templates. So instead of cultivating claustrophobia and topographic cretinism, it’s better to play on the "right" templates right from the start.