If this space it to be truly it's own, there should be more freedom to not only share ideas but actually discuss them, even if they are difficult. Reddit often felt like a place for like-minded only discussions, over and over, almost everywhere.
The negativity and toxic habits especially need to really be left there. Question shaming/ridiculing, immediately down-voting comments into oblivion just because they don't reflect the same opinions --- ending all of those bad habits would be a welcome start.