There are some BSD communities on Lemmy/kbin, but they don’t have many subscribers yet.
Here are the ones I know of:
@openbsd
@openbsd
@bsd
@netbsd
@bsd
@freebsd
@freebsd
@netbsd
@bsd
@freebsd
@FreeBSD

I created a GitHub repo a couple of weeks ago to list merch for open source projects, but there are not many things there yet.
https://github.com/makmarian/open-source-merch-list

Note: I’ve tried to make sure I found the correct link for each project, but if unsure, please double check. Also, I have not bought from any of the links listed, so I cannot say anything about the quality of the different merch.

I’ve been using EndeavourOS with KDE for a bit under 2 years now (I think) on both my desktop and laptop. It is Arch based and easy to install. And for my home servers I run Proxmox

I’ve been using EndeavourOS for a little over a year, and I am very pleased with my experience so far. The only issue I’ve encountered was a GRUB problem, which I had to fix manually using the terminal.