A good boundary has a gate, not just a fence. You decide who gets the latch.

A limit that never opens is a wall, and walls keep out the people you wanted along with the ones you did not. The useful version is selective: some people get more of you, some get less, and you make that call rather than whoever pushed hardest. Control over the opening is the part that matters.

Think about a limit you are holding now and check whether it is doing what you meant it to. Is anyone on the wrong side of it by accident? Let one person through on purpose this week, and keep it closed for somebody else without guilt.