So I made a 360 degree video in blender but the quality is terrible. Does anyone know how to make my video look more HD?
Terrible in what way? You probably need to up the resolution? For 360 you need at least 4096x2048 if you are rendering equirectangular. Problem with this resolution is that it takes forever to render an animation, so a lot of optimization will be necessary to keep your render times in check.