I would dig my heals a bit more into the SBI portion of aviationinterview.com and ask about SBI a bit more. I would also go back with interview prep done. I felt like the panel portion was strong, but I wouldn’t leave any rock unturned tbh. All my friends that made it onto Frontier told me not to do a prep service. Would it have made the difference? Idk, but at least I wouldn’t be wondering “what if I did use a prep service?” Hindsight is always 20/20 though.