What does it take for python to become a compiled language. Rather than using it's pyinstaller module which does not always work

Python IS an interpreted language, you cannot change that. You can package your application, so it would be able to run on a machine where Python is not installed. There are several utilities for it apart from PyInstaller. But this makes the application bound to an operating system. You can also run a python program / script anywhere, where python is installed already (as long as the dependency libraries are also installed) . https://www.sololearn.com/learning/2491/ https://realpython.com/pyinstaller-python/

Also you can use nuitka that compiles the script. It concerts it into C. https://nuitka.com

Apart of Python being an interpreted Language. For it to be purely compiled, one will need to make it's compiler. Due to a huge distance of Python from machine code (It is a high level language). It's compiler will be more complicated and will take more time to compile the code compared to compiling C source code which is much more closer to the machine code compared to Python.