The phrase "an increasing preoccupation" is correct and usable in written English.
It can be used to describe a growing concern or focus on a particular issue or topic over time.
Example: "There has been an increasing preoccupation with mental health in recent years, leading to more open discussions and resources."
Alternatives: "a growing concern" or "a rising focus".
His later work showed an increasing preoccupation with landscape.
The role of cities in the clean energy movement is an increasing preoccupation among researchers and activists alike.
Fire safety became an increasing preoccupation of city planners, and their regulations became a major component of every theatre design.
The last 20 years have witnessed an increasing preoccupation — among all manner of people and organizations — with financial gain.
Another reflection of the value placed on the ideal image is an increasing preoccupation with the "heroic nude".
Among early Christians delay in the promised Second Coming of Christ led to an increasing preoccupation with what happened to the dead as they awaited the resurrection and the Last Judgment.
Alok clearly showed an increased preoccupation with food during the experiment, in terms of both what and where to eat.
14 A high propensity to rehearse may therefore also cause high adiposity through an increased preoccupation with food and/or disordered eating behavior.
And then there is Stephen's increasing preoccupation with "germs" (read "Germans"), a fear that gets mixed up with his budding sexuality, which itself is somehow wrapped up with his emerging complicity with Keith's mother, his father's odd exclamations, the telltale slime on the walls of the tunnel linking the Close to the Lanes and the Barns beyond.
Although the couple presented themselves as a perfect partnership in work and life, Charles's increasing preoccupation with photography began to marginalize Ray in the office, and his chronic womanizing must have been difficult for her to bear.
He was also highly critical of the increasing preoccupation with research rankings, and the crude quantification that this often depends on.
