In the mid game, look for the mid game units like Jinx. You probably won't find any of your main 4 costs yet, so continue running your early game units and add in some transition units unless you high roll a Sejuani, Jhin, or Cassiopeia.
Additional comp tips
Chalice is good on Jinx as the tear component helps her cast her ability quickly. If you only have Zeke's though, you can look to place them on Jhin instead as the attack damage scales very well with his fourth shot. In most games, you will find Jinx first, so slamming them onto her is usually the situation you're in.