I think that your desire for a place where you can discuss the experiences unique to your generation is totally reasonable, and I'm sorry you've gotten backlash for asking how you can have the same thing others are enjoying. To me, there's obvious value in a Gen-Z community. Later generations too eventually.
My friends and life were already firmly established during the covid lockdown and I imagine that the younger you were the more impactful that period and the time after it must have been. I'd love to watch younger people talk about that time of their lives if only so I can learn more, and it's obvious I could learn other things I'm not even aware of yet from younger people's conversations.
I for one hope you stay, and even if you don't feel up to starting a new community I hope you get what you're looking for. There's nothing wrong with posting to a slow or dead community and just thinking of it like a small forum every once in a while. You're definitely not the only Gen-Z on here, and if you post someone else might feel more comfortable posting too!