Dealer offer Nakama

I’m about to buy a Mazda 3. Now I’m a dealer with my offer from Sixt, where he made an offer without much fuss. Can you look at it and tell me what you think about it? Mazda 3 Nakama Edition List price: 22790,– Navi: 690,– Paint: 560,– Freight: 790,– ———————- Total: 2483,– Discount: 3606,– (15%) ———————- Cash purchase price: 21224,– 3-way financing at 3.99%: Advance payment: 4244,80 36 x 226,– (1. Rate is something below) Final rate: 10721,– ————————- Total 23.092,– (Sixt: 20.956,–) There are still nearly 2100,– more than Sixt. If you calculate the Mazda insurance, which only exists with new cars over the dealer(?), you still have about 1000,– € price difference over 3 years. Wanted to go there again tomorrow, do you think there is still something to do?