Packaging size --> Android studio removing games default activity

Hello all,

I’ve finished making a game with UE4 and for the last week I still can’t manage to reduce my .aab file size. I have lowered graphics removed light done a bunch basically the game looks like s*** and I to lowest I’ve got is 177,214KB and that is only for ETC. Eventually I moved on to android studio to bundle it but after I open the file I get an error No Default Activity.

Is there some easy way to do this? I’m the beginner of beginners and no nothing about code, I got here with R&D

Would really appreciate your help.

Thank you