~ is not enough to solve the problem
Says that some action is insufficient to resolve a serious problem.
This pattern expresses that a particular action (often an apology, explanation, or small compensation) is not enough to settle a matter. It implies the situation is serious and requires more significant measures. It is used in formal or serious contexts, typically in writing or speeches, not in casual conversation. The nuance is strong: the speaker is rejecting a proposed solution as inadequate. The phrase is fixed; you do not conjugate 済む. Note that こと is nominalizing the whole idea of 'being settled by X'.