If possible, what I’d do is get the speakers down to ear level. Put them on stands or brackets on either short wall. Right now they are too high and too far apart for proper listening. Let alone any imaging.
You are not going to be able to do much in regards to sound management. Keep the door shut, etc. Maybe if you have the speakers placed better, you won’t need the sub so much or have to put the volume up as you’ll get a more direct sound.
Realistically, headphones are best for those times when the music might annoy others. They’re something I need to use in my place also.
Good luck. Keep listening.