What happens when circulating supply is reached?

So, let me ask you this: when we talk about the circulating supply of a cryptocurrency, what exactly happens once that number is reached? Does the value of the coin automatically stabilize? Or could it still fluctuate? And how does the market react to this milestone? Are investors more cautious or optimistic? It's an intriguing question, and I'm eager to understand the intricacies of how the circulating supply affects the overall health and value of a cryptocurrency.