If you're running a non-metal Mac, chances are your Mac will not handle macOS Big Sur or later unless you have a seriously powerful Mac such as a Mac Pro. So in this guide (Step 4Guide #4 continued), we will be installing macOS Mojave or Catalina using both OpenCore and DosDude's patcher. This will ensure even more stability on your Mac.
Conclusion
This should complete the installation on you Mac. If you are still having issues, feel free to drop suggestions or questions in the comments, and check out Guide #5.