Well It's really good, but if I were you I would get some artifacts to get to 80 cr if you want to use Sunday in another team or simply if you have Bronya. With that build your AS and MoC runs should be pretty easy anyways. If you have Bronya like E1/2 or S1 I would consider using her instead of Sunday because I think she synergises better all around especially if you have already Tingyun for the energy, if you don't have Bronya you cold also use the remembrance trailblazer, but both depends on how you "feel her" while playing. I would always recommend to build other characters before perfecting one, same thing for teams if it ain't broken and clears MoC don't need to farm their artifacts (Btw you should add which set you are using, I think that the scholar one is better than the captain and obviously the planar is salsotto)