to stay motivated and passionate about something
das Feuer am Brennen halten (das Feuer am Brennen halten)
"Even after failure, he managed to keep the fire burning."
"Selbst nach einem Misserfolg schaffte er es, das Feuer am Brennen zu halten." (Selbst nach einem Misserfolg schaffte er es, das Feuer am Brennen zu halten.)
to continue working even when you are tired or out of energy
to make something more interesting or lively
to start behaving more responsibly.
to overcome or stop focusing on something
at a point where a decision must be made
to reverse a situation and gain the upper hand