So what client do you recommend that Amethyst users switch to, in order to see everything?
Folks, if you don't have any inbox/outbox relays to your user, Amethyst users are not seeing your posts.
You can use https://metadata.nostr.com to check your settings if your client doesn't support outbox lists.
Discussion
You can't anymore. If users don't want to tell you where to find their posts, you will to connect with every relay on earth to find it. Which is hard/impossible.