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Yes raising the speakers up is a good call. I’d also experiment with blocking the ports (looks like those speakers come with bungs for that purpose?).
Maybe not possible with your setup, but leaving the speakers next to the wall and moving your seat back by about 1.5m should give more balanced bass response.
Turning the desk around would improve sidewall reflections, but the closer wall behind you would bring more problems, so I’m not sure it would help things.
I would raise the speakers so the tweeters are level with your ears, would also mitigate some of the reflection from the desk surface.
Edit: Would moving the desk to the wide wall be an option?