In the mid game, start putting in higher cost units like Kindred or Lux while making the most of the units you find.
Additional comp tips
You can put just about any utility item on Kindred. Zeke's Herald, Chalice of Power, and even Locket of the Iron Solari are all good items to put on Kindred. Ashe and Morgana split the attack and magic damage items, while Yone will be your last carry to put additional late game items on.