bide your time
bide (one's) time
To delay some action until an ideal moment or situation reveals itself. I'm just biding my time in an office job until a tenure-track position opens up at one of the local colleges.
bide your timewait quietly for a good opportunity.
Bide in the sense of await is now only found in this expression. It has been superseded by abide in most of its other senses.
1991 Gillian Slovo The Betrayal And so he bided his time, waiting, plotting, planning, looking for the signs that would be good for him.