You are free to do whatever you would like with your server, but I won't pretend this is isn't pretty disappointing.
I've enjoyed this community a lot from what I've seen so far, and was very happy to have my main account live here.
However, while I appreciate a place that is focused on being nice, and freely hostile to the hostile, I'm not interested in an experience so sheltered that it feels hidden from the world at large. In regards to your statements that you wanted to avoid an echo chamber, this action seems very contradictory.
To be clear I don't think your issues were small. Trolls flooding your instance from larger instances is terrible and must be overwhelming and unsolvable for your small mod team. However, I see this as growing pains for a platform like this. I expected a response like petitioning your recently grown community for additional moderators. I didn't expect a rejection of the larger lemmy community and the growth it has been experiencing.
I'm not exactly certain how all parts of federation work yet, but I hope I'll be able to find a server that is a 3rd party, and federated with major instances as well as beehaw, where I can make my new account, and see the greater breadth of content I desire, without being cut off from beehaw. If anyone could recommend a server, that would be greatly appreciated. If that isn't how it works and isn't possible, then at least, thank you beehaw for introducing me to the fediverse.
I haven't had a chance to try it yet but here is this:
https://github.com/CMahaff/lasim