“Good enough” is a real standard. Just make sure you picked it on purpose.

There is nothing wrong with deciding that something does not need your best work. Most of what you do should not get everything you have, because the supply is finite and some tasks genuinely do not repay it. The trouble starts when the lower standard is not chosen but drifted into, so you never notice you applied it to the thing that mattered. Deliberate is the whole difference.

Look at your week and decide in advance which two things get your real effort. Let the rest be competent and finished. When you are tempted to coast, ask whether you picked that or whether you are just tired.