There is a shift that happens in people who move from chasing success to building something meaningful. It is not dramatic, and it often isn't visible from the outside. But it changes the quality of what they create and the sustainability of their motivation.
The shift is from building for yourself to building for others. Not in a self-sacrificing sense — you still pursue your own interests, your own growth, your own livelihood. But the primary question changes. It moves from what do I want? to what does this person need? From how do I succeed? to what problem am I solving? From what do I get? to what do I give?
This shift matters for a practical reason: the things built for others tend to be better. Because they are forced to be. You cannot build something useful without understanding the person it's useful for. You cannot sustain it without ongoing relevance. The discipline of serving someone else produces a quality of attention and craft that building purely for yourself rarely does.
It also produces a more durable kind of motivation. Motivation built on personal ambition burns hot and exhausts itself. Motivation built on genuine service to others is sustained by something that replenishes itself: the evidence, accumulating day by day, that what you are doing actually matters to someone.
Who are you building this for? Answer that clearly. Then build accordingly.