Your options are
I’m hungry, which means I should eat.
Or
I’m hungry. That means I should eat.
If you’re getting pinged for using “which” wrong, it’s probably because you are using a period before “which” instead of a comma, which I’ve shown above.
I’ll be using both platforms and seeing how it goes. Lemmy has a totally different vibe, but it’s a welcome one. Feels like the old days of the open internet. Also the memes are better 😂