I tried this myself last year when LinkedIn CPCs became impossible to justify. Honestly, the attribution side was a complete mess. We used view-through tracking and multi-touch attribution, but proving direct pipeline impact within the first three months felt nearly impossible. What we did see was a clear lift in branded search and direct traffic - so the awareness piece was definitely working, but tying it to closed deals was just too messy.
The one surprise was retargeting. We took people who'd engaged with our LinkedIn content but hadn't converted, built custom audiences, and hit them with programmatic ads off-platform. Cost per engagement dropped by about 60 per cent compared to LinkedIn's own retargeting.
That said, I wouldn't recommend pulling budget from LinkedIn entirely. We kept it as the main channel and used programmatic as a support layer. Our biggest mistake was treating programmatic like a direct lead gen channel from day one instead of letting it warm people up first.
For your six-month sales cycle - are you currently tracking engaged accounts rather than individual leads? That shift helped us spot patterns much earlier.