Your LT and boxes are still too high, unless you have a PR manager which would be surprising.
Last season in EBBL the salary floor was around 400k if memory serves me right, Merch around 90k-95k average and TV 225k. Assuming you go with a competent doctor and go minimal on the other 2, no scouting, if you can average 530k gates (higher average is possible with promotion bonus, but probably somewhat of a reach with your WR and no PR):
+530k
+225k
+95k
-400k
-15k
=750k-415k. So it's theoretically possible to still make over 330k/week in D1. I wouldn't count on surviving a relegation with a 400k roster and if the losses pile up staying above 500k gates will not be easy. Good luck.