C.S,Lewis, the celebrated spiritual guru in the United Kingdom during WWII, writer of Mere Christianity, the Narnia series, most of all The Great Divorce, once said that he loved montony. I understand the feeling: if you have a routine of useful work and you feel that you are thereby being of some help to someone, you really don't invite change. Re the common proposals for change: been there, done that. Youth will enjoy it more than I would.
We do have a ('routine') break in our regular routine: the trip to the coast, to park at the beach, walk out on the sand, smell the brine and see the beautiful ocean-- a never failing delight. If we went there too often it might lose its charm, but every month the ocean is different.
Adventure? a cup of tea in the afternoon is delightful.
Taken as a whole life, just as it is, is a great adventure!