"Finding an edge" means finding something to exploit.
It means finding the fishing hole that others have passed by, and sinking your line in there.
That hole may be crowded tomorrow -- what are you going to do?
If all of your lures/hardware are optimized to that particular hole, how well will they perform in others?
So, "finding an edge" long-term means both
1) finding a market opportunity with sufficient reward-to-risk that it remains attractive, *before* the crowd comes in and sucks the opportunity dry, and
2) maintaining (your own) skills and hardware such that, when you come upon a subsequent untrammeled fishing hole, you will be equipped (with technique and tools) to fish it.
Don't be thinking that any edge you have today will work just hunky for you in 2020."Always be learnin'..."