son bir çaba sarf etmek

listen to the pronunciation of son bir çaba sarf etmek
Türkçe - İngilizce
(Konuşma Dili) shoot one's bolt
To use up one's resources, especially a singular one or one not readily restored

We were playing checkers and, although I'd started off well, I seemed to have shot my bolt too soon.

do the best that one can