have another/more than one string to your bow

to have more than one interest, skill, or resource that you can use if you need to

还有一手;有两手准备

I enjoy my work, but I'd like to have another string to my bow in case I lose my job.

我喜欢我的工作，但我想做好两手准备，以防万一失业。

She is a multi-talented woman with many strings to her bow.

她多才多艺，有多手准备。