Word filters are built into Piefed as an alternative like I use for USA news/billionaire drama, or Voyager app for Lemmy. blahaj.zone it may be easiest to just instance block. You'll still see their users, but the communities won't show up anymore as I understand it.
Then go through the all the communities list and join more. Use the Subscribed feed more often instead of All.
I'd like to help everyone homeless in my city so the LRT train stations aren't drug dens smelling of body fluids and excrement. I'd like to walk the river valley in the spring without finding thawing corpses.