That’s a tough one - looks like a very live room. The book shelf and chair and small rug may help a bit.
Your listening position should ideally be as symmetrical as possible, with the longer wall running along your left/right (speakers tend to sound better aimed across the longest dimension of a room).
Your current setup puts one speaker almost in a corner, which means it will probably have more low end (maybe more boomy sounding) than the others.
You may get better results moving things around a bit. I’m not 100% sure from the pictures alone, but one thing to consider is to put the desk/speakers where the chair is, on the angled wall, so that you have more symmetry around the listening position AND you have the speakers firing into the most space. And if you could move the book shelf so it’s behind the listening position, it could act as a “diffuser” of sorts, which would be helpful in softening the first reflection from the back of the room.
Without seeing more details I probably can’t help more. But one thing to consider with any treatments is to get “hanging” treatments so they can be moved to try different locations. I would not glue anything to walls as some manufacturers suggest, unless you’re VERY certain of everything!
For whatever budget you have I would find a set of simple panels. IF you can, put one or two on the ceiling above your listening position (if not, get some carpet for the floor - best to have at least one opposite surface treated). Also common is to put panels left/right of the listening position - imagine mirrors on the walls and put panels where you would “see” the speakers from the listening position. Also consider free standing panels for the left/right position (I have these), as they are also versatile for recording vocals or putting between yourself and amps etc.
A quick search revealed this package from Sweetwater for $249.
https://www.sweetwater.com/store/detail ... on-8-black
The key to look for is fiberglass and not “foam” if at all possible. These are only 1.5” thick, so will mostly deal with higher frequencies - but will make your room less ringey/bouncy sounding, which is a great start. Later you can add some bass traps etc.
There are many other brands to consider, I just gave the first example I came across that had good reviews and was in your price range. As always, ask around here, research online, read reviews, watch videos to see how easy each product is to work with, etc.
And keep asking questions here! (If you can post a rough floor plan with dimensions it would be helpful - some companies even offer consulting for free with a purchase).
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