You should post this on the service announcements or Services board (if you're willing to pay with BTC). In addition to that, being clear on what the ambassador need to do might also help with the recruitment. Asking the applicant might be a good idea but being clear on what you need might help with the initial filtering.
Anyone can ask in LenDefi Telegram group. LenDefi is looking for ambassadors. You can also check-out their Telegram ann channel. I just shared their ann here. I am not confirmed, are they will pay in btc or their token.