Use the nostr:npub1mutnyacc9uc4t5mmxvpprwsauj5p2qxq95v4a9j0jxl8wnkfvuyque23vg blastr @ wss://nostr.mutinywallet.com

nostr:npub1l2vyh47mk2p0qlsku7hg0vn29faehy9hy34ygaclpn66ukqp3afqutajft also runs one at wss://blastr.f7z.xyz

That will push your notes to multiple relays.