Then you never chose a password, and Google already knows which of your addresses you used. Its account chooser will show you — and sign you straight in.
Search each address you might have used for SheepHerder. Every email we send carries that word in its header and its footer, so the inbox that returns results is the address on your account. Check spam and promotions too.
That word is right even here: StreamHerder runs on SheepHerder's platform, and the mail is SheepHerder-branded whichever door you came through.
Write to support@sheepherder.app from any address you might have signed up with, and tell us what you remember — roughly when you joined, which platforms you connected. We verify who you are before we confirm anything about an account. Other ways to reach us.