Write down who believed in you before there was anything to believe. That list is gold.

Belief that arrives after the evidence is cheap. Anyone can support you once the thing is working. What is rare is the person who backed you when there was nothing to point at, when you were bad at it, when the reasonable position was doubt. That is a real risk taken on your behalf, and it is usually forgotten once results show up.

Make the list before you need it. Names, and what each one said or did at the time. Then send one of them a message describing the specific moment, because they almost certainly do not know it mattered.