If you're already at the point of thinking about national politics, you won't have an impact.
If your goal is to get more people vaccinated, the best thing you can do is going to be local. Funding or volunteering at free vaccination drives. Getting vaccination science into your local school curriculum early. Asking your local health department what they are struggling with.
It's important, if one is able, to also push towards supporting a regulatory process that allows vaccines to be researched, productized, tested, approved, and covered by insurers.
All of which the current US administration is actively trying to attack.
I'm normally on the side of Trump et al. simply being incompetent or stupid, but the anti-vax campaign by RFK Jr. at HHS is 100% targeted and coordinated at decreasing by any means available the public's ability to access vaccines.
It's more akin to religion for those anti-science fuckers. (The ends justify any means)
Each of us as individuals has only a little time each day to spend on things like this. You don't have a path to fixing national politics. You CAN help locally.
If your goal is to get more people vaccinated, the best thing you can do is going to be local. Funding or volunteering at free vaccination drives. Getting vaccination science into your local school curriculum early. Asking your local health department what they are struggling with.