Welcome. Audis lease notoriously badly (due to factors like high MF, low RV, weak incentives, etc) and that deal was during Season of Audi when incentives are much better than now.
Firstly, I’d advise that you instead look at a Premium Plus trim. They lease much better than a Prestige (which has much worse RV than P+).
Secondly, I’d adjust your expectations since incentives aren’t great now. Go to the Edmunds forums for SQ5 and gather the relevant info (MF, RV, incentives in your zip code) so you’ll have an idea of what to expect.
At that point you can try to call/email dealers for offers or reach out to NJ/NY area brokers here.
Do you know how much DAS was in that December deal? Have a link? Was it this deal from @Siejammy ? Bc that deal included loyalty, Season of Audi cash and about $700 DAS (excl 1st month) so all rolled in it was closer to mid 600s.