Most partner targets are set the lazy way: take last year, add a percentage, call it a plan. The number looks reasonable in the deck and falls apart in the field, because nobody worked out the coverage underneath it.
Coverage is the honest question. If partners are meant to contribute a share of new revenue, that share implies a specific volume of deals, a larger volume of qualified opportunities, and a total pipeline several times the size of the target. Miss any of those and the number was never going to land, regardless of how committed the partners were.
The planner below runs that math backwards from your target.