I don't know how old you are, but I do recognise the syndrome.
One can live a life whereby one is neither happy or unhappy, which might be satisfactory for other people, but not for me.
My first change was a complete turnabout for a well paid ( general practice) which was as satisfying as "watching paint dry" at the age of 30 years old to a training post in the hospital, bottom of the ladder and badly paid..........BUT...challenging, exciting and worth while.
Then aged 50years to pack in NHS for fulltime private practice.........a gamble, but brought in competition which the NHS didn't provide.
It was worth exchanging a £100,000 safe annual salary for the vagaries of private practice.
It was worth it..........if you really want to change course.......do it and do it now.