Like many here, I would like to see that reoccur. Unlike many sites, your past and previous readers happen to include industry professionals who are more than happy to provide their expertise for free. All you have to do is stop pissing in their watering hole and clean up the mess previously made.
There were two primary changes that drove away many of the previous readers. Readers who were highly educated, highly paid and in positions of decision making authority at large companies if you prefer to think in marketing terms.
The first change was the forced change of the interface to Beta which took away functionality and choice. When you are working with people in technology taking away information and functionality is pretty much guaranteed to piss them off.
The bigger issue was hubris and treating the readership as the audience. The readers are your product, not your audience. People did not come to read the often plagiarized two paragraph story, they came for the community and industry insider knowledge about what something actually meant.
Here’s the short list of things people have been asking for here for years:
Professional editors (no more plagiarism!)
End to paid shills (HughPickens.com etc.)
Links for paywalled or adblocked sites (e.g. Forbes.com — anti-ad-blocking)
End the SJW barrage the previous management had