Choosing what matters includes choosing what deserves to remain undone.

Deciding what matters is only half of it. The other half is deciding what stays undone, permanently and on purpose, because a priority that does not exclude anything is only a preference. Leaving things undone by choice is very different from leaving them undone by exhaustion.

Make a short list of things you are officially not going to do this year. Write them down. Say them to someone if it helps. It removes a surprising amount of background guilt.