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I don’t think Lemmy proper has that feature yet, but some apps might.

Other than that you could open an account on an instance more in line with your prefered blocks or use kbin which already allows for instance blocking.

Limiting the visibility of somebody voice is also censorship

It’s not (always). Especially if the people “limiting your voice” are the ones giving you the platform to reach other people in the first place, usually out of their own pocket or thanks to donations. In the fediverse at least you can always set up your own instance.

People not wanting to engage with other people is not censorship. Nobody is entitled to someone else’s attention.