wouldn’t call that a lack of ambition.
I’ve met a couple of top level keepers in my life and they have played number 2s a few years (5 or even 10)
they tell me the amount of learnings u get at a top club is invaluable. even though u don’t get to play games, but u are training alongside best players, coaches, and facilities!
besides, for a GK, u can play well into your 40. A few of them only became a first choice at that age, though playing for a smaller club. But the elite mentality they bring with them made them a star in their team, bringing great satisfaction and joy