Optimizing Package Size

Hi all,
I tried to follow a couple of guides but I can’t manage to optimize my package size (I’m trying to build an APK for Android). I started an empty project with nothing in it and the package always ends up 150-170MB. I know people managed to go down to 30MB.
Anyone has a good guide/tutorial to get to that size?

Actually there are many ways.

One of them is disable Include prerequisites installer which was under packaging ----> prerequisites section

And enable Share Material Shader Code

List only maps you want to package

And hundreds of ways man. Pointing all those makes super documentation