Ride the crest of something
Definition 1 of 1
Pro Tip 1/3Positive Momentum
Use when discussing someone maximizing a peak in success, not just beginning to succeed. 
She's riding the crest of her recent victory to secure more endorsements.
Pro Tip 2/3Metaphorical Usage
It's not about literal riding or waves; it's a metaphor for being on top in a situation. 
The director is riding the crest of critical acclaim after his latest film release.
Pro Tip 3/3Temporal Nature
Suggests a temporary state; the crest won't last forever, so the success might be short-lived. 
He's riding the crest of his fame, but knows it won't last forever.