The proposal nobody chased is a bigger leak than the form nobody fixed
Gated work does not close because you sent a good number; it closes because you were still present when the board met.
Ask a plumbing company how many association and commercial proposals they sent last quarter, then how many were followed up more than twice. The second number is usually close to zero.
A board approval is a sequence, not an event. The engineer raises a question. Scope changes. A meeting slips a month. The contractor still in the conversation at that point wins a surprising share of the time, and it is rarely the cheapest one.
Set a cadence and hold it. Confirmation the day you send. A check at one week. A check at three weeks. A check around when that board usually meets. A quarterly touch on anything gone quiet. Nothing clever, just applied consistently.
One person owns it and it lives in a system rather than an inbox. Proposals tracked in a spreadsheet nobody opens are the same as proposals not tracked at all.