The events that come before a buying decision are clearly visible in public sources. See the event types and a finished signal.

Working on Zynt signals
A decision to buy software or a technology service is preceded by publicly visible events: new funding, a change of decision-maker, team growth, a product announcement.
Your advantage is a relationship built over twenty or thirty years.
The need for people is visible inside a company long before the job ads go out.
A vacancy is preceded by decisions you can see earlier: an investment, a board change, a plant opening, entry into a new market.

Write to us. If the events at your customers are public, we can probably read them.