Act as if what you do makes a difference. It does.

Treating your actions as consequential is a stance you take first and confirm afterwards, which sounds like a trick and is not one. Whether any single act matters is unknowable in the moment it is performed. What is knowable is that the assumption decides whether the act happens at all, and an act that never happens changes nothing for certain.

You will feel the pull toward not bothering this week, over a vote, a message, a piece of work nobody will check. Do it anyway and drop the requirement of certainty. Effects are usually visible much later, and often only to somebody else.