You were relegated after a relegation series. The hit in fan support is way heavier when you relegate as #8.
My attendance income was 227k and 214k, while league average was 265k.
I'm not complaining. Just stating that your experience is not with direct relegation and therefor your hit in fan support is less.
True, that is definitely one factor.
Another is ticket prices. I see your arena is half empty....
I'm not sure but I think that if ticket prices are so low that you almost sell all tickets, you will get more money even though prices are low. I adjusted my ticket prices so that maximum income was only 362500 €, which is quite good amount in division II in my country. Only very successful teams can get more money here in division II. After couple of home games and losses, I will fine tune my ticket prices lower again....
(i'm always comparing, how much money can be received per seat category and I set prices based on those estimates)
Your maximum arena income was set to 484250 €. Not sure about your country, but I think thats too much and you suffer from too high ticket prices also.... I see that you are going to win some games and thus you expect that fans will come back, still I think that prices are too high for division II, but thats just my own estimate (no offense).