So, the phone was able to start when I held the power button and the volume up button, but it would crash after the Graphene OS logo and it showed the page where I entered my passcode (the white screen) and then it crashed.
However, this time when doing this, I am plugged into my mac and I moved to power down button when the system was loading after holding down the power button and volume and it took be into safe mode (it is also recognised by my mac). It has 58% storage used so this suggests to me that it has not wiped the device into a factory reset. I also took out my sim card because I needed to make calls today.
I do not know how to get into bootloader from here to sideline the instillation, but at least I was able to get into safemode.