Need some help with my mesh

I started adjusting it and I watched the recommended video. My back right is up so I have to get my front right down, right? In the video he said to slightly tap it with a hammer but if I do that nothing really happens. I had a dip in the middle so I loosend my x rail and now I only use 6 bolts and I think it improved, but what am I supposed to do with the left side ?
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