I took a look at your nostr.json. I think you need to have your name as your username="BTCGandalf", not your display name="GANDALF."
Discussion
Also, you need to enable CORS "GET" method in your .well-known directory. It's not appearing as reachable for me: https://cors-test.codehappy.dev/?url=https%3A%2F%2Fbtcgandalf.com%2F.well-known%2Fnostr.json&origin=https%3A%2F%2Fcors-test.codehappy.dev%2F&method=get