A couple bad losses will tank your attendance, and if you have thin margins, it can kill you.
I had a run of bad luck with game shape this year (or in a less responsibility-deflecting way, I forgot to set a few scrim lineups), and I lost games I should have won. That was a 100k/week swing in income, which I very could not afford. Had to get really creative.
Lost a few when my guys took 30 PFs vs like 10, which ... I know there is a hidden aggression rating, but come on. Lousy 11-11 season overall.
Sounds like you were in even tougher shape, but you avoided relegation. Time to retool.