Ex-lurker jumping in here.
I find much of spiritualism may fit the definition of "egocentrism' but it is actually two way as in one is all and all is one. However, the op conveys to me that it may be your point of view that is egocentric, not LOA. It seems by egocentrism you meant a "big ego" and daringly and overtly wanting and declaring what one wants with no alternatives considered. You use examples of people who are "successful" in your view, indicating you desire the same or at least find their "successes" positive and desirable. But LOA works the same for modest people, people of low self esteem and even self-loathing people as well. It also works to attract "failures" or what you consciously don't want. That's why I said it may be your view that was egocentric, as personal values and desirability were placed on what you consider "achievements" whereas LOA works as well for the opposites of such "achievements". These same "egocentric" people attract "failures" too as they likely have experiences you would not want at all. Thus egocentrism as you seem to imply does not equal LOA.
As a "technique", I think if by egocentrism you mean bold desires and intense focus excluding alternative possibilities to attract what you dearly want, it may work, depending on how truthfully "egocentric" you are. If it's fake-it-till-you-make-it, then it depends on if you succeed at faking till you actually believe it. Many highly successful people are natural at this "technique" which is innate and their true being.
JMHO to attract wisdom that is aplenty in the forum.