Large file size on iOS

Hey all,
We are having some problems with the build size of our iOS game.

Its a very basic game, about 3MB of art and not a lot of code. We do have admob ads and some sharing functionality. Our current build on the app store is 70MB. I had looked into reducing the file size with striping and it worked, reducing the file size to 39MB

Since then we made a few changes, mainly just small bug fixes. But now whatever I do the builds are coming out as 70MB, I have tried all the different levels of striping, but nothing seems to work to get the file size down.

This is the game
https://itunes.apple.com/us/app/street-drift-86/id1001072571?ls=1&mt=8

Any help with this would be much appreciated, I fear that the large file size is scaring some people off.

Thanks and regards,
Lucas

This has been solved.

I am not the one who fixed the build, so I will try to explain it best that I can.
Since we were using IL2CPP, the build is essentially already stripped.

On the archive upload there is a tick box to strip debug symbols, this fixed it and file size is now 39MB
My coder must have ticked this when we did the previous build, but forgotten about it.

Regards,
Lucas

pls help me. !