Sudden things have long fuses. The call that changes a year comes from someone who saw your work eighteen months ago and remembered it when a chair opened up.
You can't schedule that. You can make it likelier — by being findable, doing work with your name attached, staying on decent terms with people who move around.
None of that feels like career strategy on a Tuesday. It looks like answering a message properly, or finishing something well when nobody is checking.