I've just been blocking every newsbot and news community and politics community that I come across. It took a few weeks, but my feed is like 70 to 90 percent better than it used to be.

I honestly wish the Fediverse had categories for the types of magazines or posts that it has, and you could filter out an entire category. That would make me so happy.

Yes, you can block users, communities, or use the subscribed view and don't subscribe to them.

I think you can block the news communities.

I think you can also block keywords, or maybe this will be allowed only on Lemmy 1.0. I'm not sure right now.

i'd avoid news and politics communities. there is also an option to ignore bots, but that requires bots honestly declare themselves as bots. that is afaik all you can do.

If you must browse places other than your subscribed feed, I'd suggest blocking news and country-related communities. Exceptions may happen, so maybe worth not being too trigger-happy and evaluating if the community is problematic.

Also, since you're on Lemmy, there's no native option for it, but you can hide posts with Ublock Origin when they link to sites that are usually agenda or political bickering-driven.