So here's some unsolicited advice (yay!):
Websites that change owners frequently pretty much scream "potentially valuable asset that nobody has figured out how to make money on!" Because if they did actually make money, they wouldn't be getting sold. So Slashdot is a pretty obvious money sink, but it does have a desirable reading audience, many of whom are absurdly vocal about how they don't want to read ads, subscribe or otherwise do anything that would, you know, make the site profitable.
My advice? Focus on content quality - Slashdot could easily post 3x the stories it does today, and have better QA - just by maybe hiring someone with some journalism credentials rather than making the people who write the back end server code pretend to be editors. Improve the quality and make it "must read" material that people are willing to pay for. And try encouraging some writers to create original content - not BS video interviews with talking heads from sponsors, but actual longform journalism. If Slashdot is actually a good enough read, you can monetize a subscription tier that echoes "Slate Plus," "ESPN Insider," etc.
In Slashdot's "glory days," it didn't have a lot of competition. There was no Gawker/Gizmodo/iO9/whatever to read about the coolest Star Wars prequel rumors; people came to Slashdot for that. Even though there's a lot of competition now, Slashdot (barely) hangs on to a superior virtue: a better quality of commenters and a better moderation system than other "nerd" sites. Slashdot was never very well managed, even back in the "CmdrTaco/Hemos Glory Days." Inject some QA into the story vetting/writing process and you'll see a resurgence of readership.
Let me continue to beat this dead horse: all that Slashdot really has going for it is a (minority) smart readership and a superior comment rating system. Explore and improve that. Gamify the f--k out of Karma. Do profiles on crazy frequent Slashdot contributors (not Bennett Hasleton) and let them have a real name and a voice. More badges, go back to numerical representations of karma, give higher upmods to really good contributors, whatever. Reward posters that get a lot of up- or down-mods because they're usually saying something interesting one way or another, even if they're being mod-bombed by ideologues. Reward longer posts. Finally introduce a "-1, Factually Incorrect" mod. This mod system is your real asset - pay some attention to it, which hasn't been done in many many years.
Thank you for showing up to answer questions. Please continue to be engaged. Slashdot has always shown an astonishing lack of self-awareness! Why were there thousands of off-topic posts about how much Beta sucked and why? Because Slashdot's editors didn't even think through the idea that people have opinions of their product enough to introduce a way for people to have meta-discussions about Slashdot. When your readers/commenters are the "product" to your advertisers, how do you not give them a place to comment/vent/respond about Slashdot itself? In the 15+ years I have read this site, I don't remember a single post from "management" saying "how are we doing? comment here." That's just either willful disregard of feedback or idiocy. And seriously, the site itself gets sold, and the post about it is when somebody else submits a link? YOU DON'T THINK THAT'S SOMETHING YOU COULD HAVE ANNOUNCED YOURSELVES? I mean, WTF?
Lastly, please just be open. What's working, what's not. I think people would be willing to turn off ad blockers or pay for Slashdot if someone in charge just said, "Hey, we lose money on this site. We need help. How are you willing to support us? Do you want to donate (a la Wikipedia) in exchange for having ads turned off? Would you be willing to subscribe? Can we do more ads if they follow a certain vetting process?"
It's sad to admit this, but Slashdot has been my "home page" since at least 1999. I'd hate to see it go away, and I'd love to keep it alive and healthy, as long as it's worth keeping.