Between Lemmy.world desperately needing new mod tools, Lemmy.ee disabling image uploads, and the two main Lemmy.ml devs working on Lemmy for less than minimum wage, I want to urge and remind everyone to please Donate!
The Lemmy devs have refused advertisements, refused collaboration with Meta, and focused all of their efforts (and then more) to support the wave of users who left Reddit. The Lemmy devs did this, as they let the work owed to their sponsor take the back seat, to give everyone here today reading this message the best experience possible.
Lemmy is already at 1% the size of Reddit, but only has 2 full time employees. Not only do they deserve more for the gruelling hours they've put in, but so does everyone else who's contributed too.
Are you using the official lemmy webapp, or an app?
Pretty sure there was a browser extension that blocks posts containing keywords in the lemmy webapp IIRC but can't remember what it's called, if you do a search for a community called Lemmy Apps you should find one there
https://lemmy.world/post/465785
Aside from that, if you're on mobile most of the apps support keyword blocking & filtering in their settings, such as Eternity, Connect, Mlem, Memmy and Sync