I think the role you're trying to fit, because it is moreso task oriented and not product (deliverable) oriented, is not a good fit for the websites you're describing in the comments. Aside from that -- consider something else.
I run a business. Now, please keep reading - but this is not a personal slight to you, okay? It'd be a rare, rare, RARE occasion when I allow someone who I've never seen, who lives in another country, who I am likely to never meet face-to-face, to connect to my business Windows (or other) infrastructure machines from wherever I've been told such a person is located, and then assume administrative tasks!!! That person might be the best administrator in the world but if something's screwed up and I incur a loss, I can't say, "Oh, not my fault. Blame Lars/Abdul/Kiswele/Hanna in Senegal/Budapest/Mumbai/Caracas"!!! I can't establish a chain-of-control, and would thus be held liable for any damages. I can't sue and recover those damages from someone halfway around the globe -- at least not easily.
If such a person were attached to a larger business, it might work out better - but I'm still not going to pass on much in the way of administration tasks. It leaves me far too vulnerable.