20 relays is because people's clients are adding a bunch of trash to people's outbox lists. 3 is all that Amethyst needs. The smaller the number, the easier for others to find your posts.

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Thanks so much for the reply! That makes sense, I see some clients adding onto my specified relays. Honestly I wasn't sure whether to use more or less, but now I'm going to reduce my list to just 3. One more question, do you have a suggested set of search relays? Having difficulty seeing which relays support NIP-50.