The person who volunteers for difficulty often earns access to uncommon experience.

Difficult work is under-subscribed, which means volunteering for it puts you somewhere with very little competition. The experience that follows is uncommon precisely because most people declined it, and uncommon experience is what eventually makes someone hard to replace.

Look for the task nobody wants that would actually teach you something. Take one. The cost is real and the position it puts you in afterward is not available any other way.