How does one get over a career that is no longer as fulfilling as it once was?

I am in the process of moving AGAIN to seek fulfilment in a job I enjoy in the moment but no longer find intellectually fulfilling and rewarding.

It is a safe and day by day job with plenty of good people but the structures and demands are no longer serving THEIR purpose or my fulfilment.

Problem is, an alternative is not immediately available or even inspiring moving on.

How does one find new fulfilment in their decades long career after so many disappointments?

How does one get over a career that is no longer as fulfilling as it once was?
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