[Taek]

This seems like a problem you can only solve with an invite or credential system. If you are an invited writer (or have some sort of literary degree) you can submit content, otherwise you gotta let people invite you. AI content is still allowed, and if you post garbage you lose your posting privileges.

[JdeBP]

Has that observably worked for Citizendium or lobste.rs, which have tried exactly that for years, though? Have they been widely recognized as superior to Wikipedia and Hacker News? Have they in fact been widely recognized?

If your answer is that Wikipedia and Hacker News still get the recognition and haven't collapsed, then I suggest that there are already examples to learn from that the same idea for Stack Exchange won't work.