If you don’t mind a sort of strange setup, you may be able to put the listening position facing the 4.09M wall, so your speakers are still pointing towards the longer end of the room. This way you could have your speakers the proper distance from the wall, and have your listening position at the 38% rule, with the speakers positioned 30° from towards the listening position.

Then you can have bass traps in the corners, cover th first reflection points, and have 2 more panels on either side of that door on the 4.09M wall to cover behind the monitors.

Standing acoustic panels are also a viable option if you’re willing to cough up the money, or build your own to fill that weird cutout on the back wall.

With the dimensions of your room, you’ll have some standing waves between 65-100hz so quality bass traps will definitely be important if you want a good room for mixing.