Being available constantly can reduce the quality of everything you are available for.

Continuous availability degrades everything it touches. Attention split across a dozen possible interruptions means no conversation, no piece of work, and no person gets the whole of you, and the accessibility that felt generous ends up delivering a thinner version to everyone.

Choose when you are reachable and be fully present the rest of the time. Being genuinely available for two hours is worth more to people than being nominally available all day.