Android studio project stopped working after update?

Question

android studio

I received a letter from Google that I need to update the project to 64. To be honest, I'm an amateur, I'm picking android studio out of curiosity. For a long time I did not run Android Studio, because there was no time. Recently launched. The program was asked to be updated, and Google also asked to make changes to the projects ( Prepare the application for the new requirements for the 64-bit version
From August 1, 2019, all new applications and source code updates will need to be published on Google Play not only in 32-bit, but and in the 64-bit version. We recommend that you familiarize yourself with the new requirements now so that there are no problems in the future. )
Probably many people received this.
And so I updated Android Studio and away we go. A bunch of mistakes, everything is strewed. Found various solutions, but they did not help. The latter gave the result. the project is compiled, installed on the phone. And then it won't start. Searching for a solution to the problem in Google did not yield results.
So I decided to turn to you dear Internet users.
Please help me how to solve the problem. Since I am an amateur and did not earn anything from this, I am ready to give five hundred rubles for help. link to the project https://yadi.sk/d/jrnZ6g-kOVyz7A