look to your laurels
US /lʊk tu jʊər ˈlɔːrəlz/
UK /lʊk tu jʊər ˈlɔːrəlz/
1.
to be careful to maintain your position or success, as someone else is trying to achieve the same or do better
:
•
The new intern is very ambitious; you'd better look to your laurels.
•
With so many talented young players coming up, the veterans need to look to their laurels.