Only kept 2 AOV's specular and emission and didn't put any displacement or bump mat and rendered 130 frames and finally I was able to render it. Because I didn't put diffuse AOV which is why, when I put levels on my small lights of ufo it gave my a really bad result which initially I thought is a viewport problem as my file was big, but at the end I realized It was because of levels and maybe I didn't rendered diffuse Aov.
