[kubanczyk]

> by the end of the day I'm usually feeling so exhausted that I seem to struggle to do more then lie down as mindless zombie

Fix that part instead. Then your problem is reduced to: "I come from work everyday slightly tired, but overall in a vibrant mood, how can I learn, oh, wait, nevermind."

In your state looking for more tasks is decidedly putting out fire with gasoline.

I would primarily get any FOMO out of my life until you find balance. Identify any inputs in my life (colleagues, motivational videos, messaging channels) that make me feel inferior and force me to work harder and learn more. Reduce these inputs mercilessly. (I can always choose to re-introduce them later.)

This will hopefully give some breathing space, so you could take care about the main problem: can you change any aspect of your current work to stop turning a "mindless zombie" day by day.