Democrats added antitrust to their 2018 platform. It's a bit milquetoast and avoids mentioning the big players but it appears to be a start. It'll be interesting to see whether it's a throwaway or if they might do something with it.
Probably depends on if we actually get grassroots, progressive Dems into office and force them into a more populist stance. We are also seeing the likes of Elizabeth Warren and Keith Ellison championing more progressive ideals and gaining popularity with the voter base.
Up to people to spread the word on these, if every person knew 1 or 2 progressive politicians (no matter which side, aka in relation to those regressive in the democracts and those progressive in the undemocratic aka the republican, party) and shared that with others there would sooner rather then later be a change - be the impact you want to see.
Adding something to the platform is a start, but as we've seen from the post-financial crisis era, there's a huge difference between having laws that should put bankers in prison, and actually having an executive with a desire to execute them.