If you lose the passion, and get bored with what you do, you're not going to care, and that's a worse fate than even staying still skill-wise. It's a very common fate for those who have to work at this 8 (or likely more) hours a day, nearly every day of the week for years or decades.
So I'd just try to keep the flame alive, focus on always doing what you genuinely enjoy, and not sweat the rest.