Tough room and layout.
Without changing speakers, that room would be best in terms of acoustics if you would reorient/rotate the system one wall to the left, for a symmetric layout and orientation to corners and side walls with your mains. That obviously conflicts with the video part of the equation, though.
So back to how it's oriented in your photos...you could try and ameliorate the hard early reflections with treatments. The couch at the mlp being smack up against the back wall isn't ideal either.
Trying to fix a suboptimal room situation may be better achieved with a swap to different speakers that work for you rather than against you, as opposed to a bunch of room treatments. Speakers with narrower dispersion could be employed in such a way to sidestep the issues that arise from wide dispersion speakers in assymetric settings. Prolly help those seats on the couch under the window be more listenable vantage points too.