Flashing a custom ROM voids your warranty and carries a risk of bricking your device if done incorrectly. Proceed at your own risk.
Because native custom ROMs for Unisoc chips are limited, is your best option. These are universal ROMs designed to work on any device that supports Android 9 or higher. realme c30 custom rom
Custom Recovery: You will need a tool like TWRP or OrangeFox installed to flash the ROM files. Flashing a custom ROM voids your warranty and