No offense, but if you didn't provide an issue, the person that sold you the traps could have sold you anything really

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You have now 6 traps of approx 0.7mΒ² each, covering roughly 4mΒ² of the total surface of your room (count the surface of each wall, ceiling and floor and you'll see how much % you are covering with the traps). If you know that a 100Hz wave has a 3.43m wavefront, you see where this is (not) going.
You mention room dimensions, however you didn't provide any.
So if you want to hear a change, and have balanced absorption in the room, you'll have to think way bigger. Covering complete backwall, early reflection points (your mirror thing) floor to ceiling and left to right, complete corners, by preference 1m+ wide traps. The traps will need to absorb down to the most problematic frequencies in the room (which you can find by measuring).
Still there will be spots in the room where frequencies will appear louder and quieter, this is how sound physics work, sound waves have either high velocity either high pressure and this varies throughout. The goal of acoustics is to provide a balanced spectrum at the listening position(s).
If you have the patience and the will to do it yourself we can help you here, but it will be step by step. If you are prepared to spend money you can hire an acoustician. If you are prepared to spend a lot of money you can buy lots of panels and throw them at the walls, the result will be unpredictable

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If you are willing to install REW and perform measurements (yes steep learning curve ahead), I'm willing to guide you with posts and answers in this forum, so others can chime in where my knowledge is stopping.