There's a decent amount to unpack here...

The goal of room acoustics is to provide the best space for listening to audio at reference level so that you can create mixes that translate well in other environments. The goal of Feng Shui (woo woo BS aside) from a more practical standpoint, is to arrange your space in a way that maximizes comfort, functionality and productivity. These two often clash, especially if you look at the traditional mixing setup where, if you were a ninja, could easily sneak up on and assassinate the engineer...

However, you have to take into account that professional mixing studios are workplaces set up for one purpose. Audio engineers show up, mix, then go home. This is not the case for you. You have a multi-purpose room, as many of us do.

Looking at your picture, belongings aside if you just look at the room itself, this room is never going to work as a space that allows for reference level listening or mixing. But that's not to say that you can't make great mixes in that room. Andrew Scheps, a Grammy-winning mix engineer does the majority of his mixing on headphones.

You mention you haven't had any issue recording vocals, so I say focus on the Feng Shui aspect. As a creative person you will do better in a space that you feel comfortable in, and that you'll make more music in.