One site I have always felt at home with is
It is a gen fic archive specializing in stories about Aragorn and Legolas.
A few months ago, the site owner asked if someone else would take over, as she no longer has time to run it. She is happy to continue to pay hosting costs. No one came forward and the site is sadly neglected with hardly anyone now posting there.
I know nothing about coding or I'd take it over myself, but I'm posting this in the hope that someone with the right degree of expertise might come forward. It would be dreadfully sad to lose another Tolkien archive.