The fediverse isn’t one thing and lemmy in particular is censorship proof, meaning there isn’t much you can do besides tailoring your own experience and filtering the feed to suit you. My instance doesn’t federate with lemmy.world or lemmy.ca because they are not well run instances without any oversight to their users and it’s mostly spam. My instance also fully disables downvotes because they are all spam as well.
Admins can, I do on vegantheoryclub.org but lemmy.world and lemmy.ca will not. The admins don’t agree with your take and aren’t going to change their minds so the only recourse you actually have is to invest in and build your own server and federate with who you align with.