Wiktionary
other fish in the sea
n. 1 (&lit other fish in the sea English) 2 (context idiomatic metaphor English) Used to indicate other goals or other objectives to pursue. 3 # (context idiomatic metaphor English) Used to indicate other romantic partners or significant others to pursue.
Usage examples of "other fish in the sea".
Besides, there were other fish in the sea besides Sir Basil and Monsieur Bernard.