Before starting to think about the uppgrade order, you should try to improve the deck itself a little bit. Shrink the deck to 30 cards if possible, and get pendulums instead of two kinds of pillars. You might as well ditch the procrastination, morning star, miracle and some pillars to achieve that. After you have made the deck as consistent as possible you can start thinking about the upgrade order. In this case, the upgrade order pretty much depends on the build. Sundials and pillars would be the priority in my opinion. But as I said, depends on the build(that is which mark and pendulums you choose to put).