yeah, you're down to like 3/4 a career left, it makes sense that you feel that way. Less runway ought to feel different.
I do agree that a safe 'next' is unclear. But I also think if ai truly hits all knowledge work as hard as it might we're looking at up to 50% unemployment. Frankly there is no point career planning at all in that scenario. We will all have much larger problems.
And if it doesn't, then pivoting to some field with a combination of rewarding work and 'enough' pay seems sensible enough.