First, should have/had an owner with 0 connection to previous owner. Clean start, lots of content already there.
Then, prime the pump.
Owner should be active. New mods should be active. Regulars should be active. When suggestions/problems come up, handle them with the quickness. I couldn't navigate the site back when it was falling apart because some banner used to block the nav bar, for months nothing was done. There was a poll about some new update/design, a lot of people didn't like it. Some issues with payments from that football pool didn't help either. Later got somebody from Ireland that was actually doing good things, but too late. This is when new gtlds were taking off, site should have been active as hell. Seemed like the original owner kind of lost interest in the site.
Try to get one/many of the "big domainers" to post there regularly. Newbies love that stuff.
Get sites like DNJournal to update on a normal basis like they do here.
Hire a domain lawyer to give free advice. That's something that will bring people back to the site. People will go to sites they feel bring them value.
You have some die-hard DNFers, maybe? But you need new blood as well.
Mass PPC campaign, other advertising, domain events, make sure SEO is on point etc. Get new users.
Give out subscriptions to various domain tools out there.
There is a lot more you can do. Need to be active, need to put some money into it.
Then, just maybe it would have a chance.