There's a lot of stuff written on this topic, but I haven't seen this mentioned yet: there are conservative instances on Lemmy, as a platform. Most of them are widely defederated, not necessarily for the views of the majority (though in some cases, yes), but because of asshats deliberately causing trouble.
Unfortunately, this is also a product of a wider shift in discourse by the right (understood in a North American context), which appeals mostly to edgelords rather than the (rapidly shrinking, already shrunk to the point of irrelevance/non-existence one could argue) thinking, at least ostensibly humanistic conservative.
There's self-selection in action here. Which makes sense, even if I also find it troubling (there are people who can be reasoned with drowned out by Nazi assholes, who are willing to hear people out on the not-Nazi stuff, give positive reinforcement and with it a home to get radicalized).
I don't have a good answer, and if I did I'd probably be up for a Nobel Prize given how wide and damaging the problem is. It ain't just here - it's pretty much anywhere anyone expresses any idea. I just happen to like this side of the Threadiverse much more, so it's where I hang out.
Only real hope is meatspace, imo. And even then, not everyone has the privilege to engage this way in meatspace without a direct risk to their personal safety (see POC, our trans brothers and sisters, LGTBQ+ folks, etc.).