So you just switched from web design to SEO because you thought it would be easier? And your plan is to do "trivial tasks" (?) for authority sites so that they give you a link in return? Then once you have a bunch of links from your trivial tasks, you become a SEO agency and WHAM you start getting traffic and clients start contacting you and you are able to close them and you magically learn how to do SEO for the clients instead of just taking their money and scamming them? Am I missing something here? If that sounded accurate then no sh*t you are stuck, you don't know how to do SEO, let alone get people to pay you for it...