What Blackhat Techniques To Get Value From Sites Crushed By HCU?

Hey guys, like many I find my old sites that were considered the authorities (or one of) in their niche a few years ago to have more or less been de-indexed by Google in lieu of the trash they currently choose to rank

With many sites I have been able to A, B, C.... Z test thousands of different white hat things, as most in a similar situation know none of them did a G D thing

To make it even more annoying I consistently see spun versions of my main site that was earning five figures a month for a handful of years ranking on page 1 as my pages they copied and TERRIBLY re-wrote get no traffic

So... what type of black hat techniques can be used to get any value at all out of a site or sites that were killed off by the HCU?

I tried everything I can think of, I have patiently waited 1.5 years for an algo update correction.... but it is clear by now this is the new reality and the sites have little to no value unless other actions are taken

I just don't really know what actions that could be

Mostly talking about posts that promote dating sites.... where to meet women in cities and stuff like that

Any tips appreciated

have you seen this yet? Not sure if it helps, but it's an interesting read nonetheless

https://www.blackhatworld.com/seo/spider-pool-networks.1706340/#post-19154605