Did you already set it like this?
wss://filter.nostr.wine/REPLACE_WITH_YOUR_NPUB?broadcast=true
Discussion
I have it set up like this right now 
💜
Good, you should be okay now 😅
If you want more guarantee then you can add this relay
wss://nostr.mutinywallet.com
This is special relay (broadcast or write only) that capable to broadcast our notes and event to many relays (300 online relays). I assume you have followers with different relay, so this one might be help too.