The simple answer is this: You need a more diverse higher education sector, which I think is tricky to do. I think there are some reasons why, traditionally, certain kinds of people might be attracted to universities. They might be on the left, generally. I think the ratio is so skewed that it's hard to think other factors aren't involved. I would think that, at a host of levels, there are things you can't do, like job advertisements. But for things you can control, like research funding, you need to think about the way in which certain disciplines contain political assumptions within them and try to open those out to more diverse perspectives.
If you have a field in a funding agency in something like settler colonial studies, it comes with a whole host of political assessments. I mean, I'm fascinated by the history of settler colonial nations, but my perspectives are not welcome in settler colonial studies. If you're advertising a position in that area, it's not really open to diverse perspectives. Whether you're advertising jobs in these fields or advertising research funds, you have to include that kind of small-p political assessment to make sure you have institutional neutrality—