Unfortunately, a lot of instances that block have a double standard where they won't allow nazis but allow anarchism and communism, and all the other ideologies, with people openly promoting harassment towards others. I have not seen an instance that blocks both yet.
You can always create your own with like minded ppl.
Maybe some non political instances are a shot worth.
The problem there is that everybody has its own definition of “extreme left” and “extreme right”.
So it could be that your preferences are just a bit niche or something like that :)
