Provide advice, but don't waste your limited time on extensive teaching.
In the end, he must become a believer by delving deep into the Bitcoin rabbit hole, on his own accord.
Discussion
#Bitcoin educational resources:
1. https://nakamotoinstitute.org/shelling-out/
2. https://www.hardmoneyfilm.com/
3. https://fountain.fm/episode/eumqR5JSyLx9ZPx9uoyv
(+ The whole Saylor series)