If your routine never makes you uncomfortable anymore, it’s maintenance, not growth.

Comfort means your body and your brain have adapted, which is good news about last month and not much news about this one. A routine that costs you nothing is holding you where you are, and holding is a perfectly fine goal as long as you know that is what you picked. The trouble is only ever expecting to improve while doing what you already find easy.

Add one uncomfortable element to something you already do: a heavier set, a harder problem, a piece you cannot play yet. Keep the rest identical so the change stays manageable.