One thing I notice is your deck doesn't have much focus. You seem to halfway try for an artifact theme while not going full-on for it.
Another thing I noticed is that you splash green and white mana with
Restoration Gearsmith and Blossoming Defenses, without much of a reason or any way of paying those costs, if you don't draw a Spire.
The most important thing in any deck is a win condition, and yours seems to revolve around getting Bolas on the board. But when you shuffle your deck before the game, and he happens to be 3/4 the way to the bottom of the deck, what do you do? You need either a way to find Bolas, a way to survive until you draw him, or 3-4 of him in order to get him out reliably.
Hope this helps!