Don't know if this'll help but I used a third person to get something to my W last week.
The result? "Tell Ken that we need to work this out between us. Not involving any one else".
That's after no contact for quite a while. Don't know what triggered it. The results have been great - texting, talking even meeting (will be doing that tonight).
Don't know if this applies to you or not. My 2c worth.
The going dark bit is for someone far more experienced than me. I was totally confused, flapping like a fish out of water and tried it (gunshot method - no idea WHAT I was doing).
I sure got everybody's attention. Friends were calling other friends to find out where the heck I was, what I was doing etc. But I got a huge wake up from one or two of the guys here saying going dark was just more of the same treatment I'd been giving W for years. I immediately dropped it and all of a sardine - "Houston we have contact".
Puppy has been round for a while (no disrespect Puppy) and I'd value his advise greatly.