The chance usually shows up without warning. Being ready is the only part you control.

Opportunities arrive on their own schedule and almost never with notice. That splits the situation in two, the timing, which is not yours, and your condition when it happens, which is entirely yours and built quietly while nothing is going on. Preparation is the only lever you have on an event you cannot predict.

Ask what would need to be in place for you to say yes tomorrow, and put one of those pieces there this week. Skills, savings, a portfolio, a reputation for turning up. Then stop watching the door and go do the work.