Learning to let go is one of those skills that no really thinks of “mastering” until it occurs to them that they need to.
Depending on the circumstances, people can let go of things very easily. When whatever we are dwelling on feels inconsequential or already impermanent, we probably don’t care that much when we lose it or let it slip.
Other stuff, though- the important stuff, the intangible things- can keep us hung up for years as we learn that they were just as impermanent as everything else. Maybe we know that “this too shall pass,” but were hoping to get lucky in a macabre way- thinking we’d never get to see their end and thus it can feel eternal.
All things end, though. It’s the price we pay for getting to experience them at all, and it gives them their worth and rarity. Learning to let go with compassion and grace is vital to emotional wellbeing– and that can include letting go of goals and dreams as well. Giving up on an old dream can set you free to find a new one.