Petunia, gardening and tradwife influencer
Petunia Evans is well-known on YouTube, Instagram and Tiktok, as a lifestyle influencer. She's skilled in gardening, beauty / health (including hair and skincare), and of course cooking and caring for her family. She's at the head of the neighborhood association, and goes to the church every sunday.
Sometimes, she has made video collabs with conservative politicians, as she's promoting "family values".
She's somehow hypocritical, because she promotes "tradwife" lifestyle for other women, but she herself earns a lot of money (through monetized videos, merch...) as a content creator. Occasionally, she even outearns Vernon (her revenues ebb and flow).
She's very proud of her normal yet successful life.
It means that the Dursleys act as a "loving family", at least in front of the neighbors (and the camera). Harry also always had a normal (and well-decorated) bedroom, as Petunia loves to show off her home life.
It also means that she pressured Vernon and Dudley to get thinner, because it just wouldn't do to have an obese husband and son. She also beautified herself as much as she could (through tailored clothes, make-up, possibly some aesthetic surgery...).
In addition, she never allowed Dudley to become a violent, loud and obvious bully, or to act disruptive in school, because (again) it may tarnish her image.
Dudley might still have bullying tendencies, but he would do it in a stereotypical "mean girl" way (spreading rumors, making backhanded compliments and subtly humiliating observations, putting people in humiliating situations "by accident", etc). A subtle, underhanded bully who uses social violence. While acting like "a good kid" and "nice" around adults and authority figures. And being one of the most popular kids in school.