You can probably try using nfrelay.app . It has already spam filter implemented to handle RplyFamily and Impersonator. Let me know if you have still those spam while using the relay 👋

Additionally you can also add WoT relays to help such as:
- wot.utxo.one
- nostrelites.org
- wot.nostr.party
- wot.siamstr.com
- nostr-relay.app