Your suggestion that gender roles are entirely arbitrarily fabricated by society, is demonstrably false. There is an absolute ton of peer reviewed study and literature on it going back decades. People do what they want to do, and men and women have extremely different interests and motivations in life.
Why do you think women don’t want to be plumbers? Do you think it’s because society decided plumbers are men, lack of female plumbing role models, because plumbing customers are all sexist and only employ men, OR because women aren’t generally that interested in plumbing...
Why do you think in countries where they have tried the most to get them to be plumbers, women have rejected it even more?
Why do you think women should want to be plumbers?
Men and women are extremely different in so many different ways, which should be celebrated, not denied.
Obviously anyone male or female who wants to be a plumber should be encouraged. But we should also freely acknowledge that 95%+ of plumbers are men, and that isn’t a ‘problem’ to be fixed.