Wiktionary
have other fish to fry
vb. (context idiomatic English) To have more important things to do.
Usage examples of "have other fish to fry".
However, I am intending to say nothing till it is settled, though I will just say this much, that you soon may have other fish to fry than to think of Stephen Smith.
And they hoped to have other fish to fry, or rather, apples to pick in the Pacific Northwest.
Really I will sell myself for Bobby but I have other fish to fry tonight.