Libya was not a NATO obligation. Some countries just decided they want to bomb Libya. They’d done it regardless of there being NATO and for example a non-NATO country Sweden participated while many NATO countries didn’t.
So far the NATO Article 5 has been invoked exactly one time - by the USA after 9/11. UK had a reason to invoke it during the Falklands War, but they didn’t want to.
First thing NATO needs to do, kick Turkey out.