"That's enough (for me)" is (나는) 그걸로 충분해 in literally translation (충분하다 = is enough). But we tend to say 됐다 in this context, which is past/perfect form of 되다. One of 되다's many meanings is "to be sufficient/good enough". So you might say. - 난 그걸로/그것으로 됐어. That's (good) enough for me. - 난 그거면 됐어. That's good enough for me (implies I don't need anymore).