How to reduce mobile game size

Hello, i have recently published my first mobile game but the size of my game is just huge. I have 10 low poly levels and default car… Right now the size is something around 500MB. I knew that ue4 isnt greate for mobile games but there has to be some ways to bring it down somehow. So my question is is there any way i can reduce size of my game? Thanks.

You failed to mention if its Android or IOS, but there are a few guides on UE4.

http://zompi.pl/reducing-build-size-of-android-game-in-unreal-engine-4/

http://www.moreporkgames.com/devblog/2017/2/10/reducing-the-size-of-your-ios-or-android-app-unreal-engine-4

hope these help.