I’m not well versed in Lemmy so this might be totally incorrect but I think if you share a link, instead of the c/ you put “!” at the front so people of different instances can open them community on their own instance.
I’m basically just regurgitating what I’ve read and it could be wrong.
Also just for the sake of conversation, one of my favourite wholesome Reddit subs was mum for a minute where people without mother’s would go for motherly support and congratulations. I haven’t seen anything like it here yet.