A mediocre plan completed can teach more than an exceptional plan protected.

A finished mediocre plan generates contact with reality, which teaches things no amount of planning can. A protected exceptional plan teaches nothing, because it never encountered the conditions it was designed for. Completion is where learning happens, whatever the quality of the design.

Pick the plan you have been refining and complete a poor version of it. The lessons from finishing will improve the next attempt more than another month of improvement to this one.