Build proof instead of repeatedly describing potential.

Describing potential requires the listener to take you on trust, and that trust is finite. Proof requires nothing from them, since they can look at it directly. Building one demonstrable thing does more than any number of confident descriptions of what you could do. A single working example ends arguments that description keeps reopening.

Instead of explaining your capability next time, show something you made. It shortens every conversation and removes the need to be believed.