You should always direct people to a landing page where they can choose from or be directed to multiple different instances.
https://kbin.pub/en or https://kbin.fediverse.observer/list
https://join-lemmy.org/ or https://lemmy.fediverse.observer/list
You can direct people away from specific instances if, for example, they have been de-federated.
Sounds like a centralized system like reddit is more your thing then. There’s plenty of replacements out there like Squabbles that are centralized.
I absolutely would prefer Reddit - as it was under Aaron, before the takeover by Conde Nast/Advance & Spez. I’ve been on Hacker News, I looked briefly at Tildes. My goal is to be where the single largest user base is, to most effectively consume and communicate from a single group.