How do you raise your voice in a community if you get silenced there?

You don’t raise your voice (making more noise rarely helps, imho). You raise everyone else awareness that something odd could be happening in regard to some people/you being silenced?

I have never considered the question (I try not to participate in communities where people abuse their power, or to discuss with people that consider a personal aggression any disagreement or diverging opinion) but the first things that come to my mind is that if you get silenced (that can’t be know for sure before trying to publicly post your question in the community), you can still post in other communities that you know members of the first community do read (or in communities created to raise awareness on power abuse, and ask for suggestions). And you can message other users directly to ask them to raise the question publicly for you since you’ve been silenced. And then you can create your own community and start posting: the public timeline is, well, public, anyone will have a chance to read your post. But, really, those are just the first few ideas I would consider if my choice would not be to avoid being in a situation like that to begin with.