I believe that what we call "Luck" is nothing but a process set in place.
Even our first sale, or the second sale, or the forthcoming ones happen because we learnt something and followed some set process.
When we realised that that process started giving results once, twice and so on, we started repeating the process again and again, which is called Scaling Up.
The more we repeat the same process over time, the greater we see the results following on a consistent basis.
In short, there is no Luck, rather just learning, implementing, analyzing and repeating. (PROCESS).