How to root

Can anyone guide me on how to root the Oppo A54 (CPH2239_11_C.33)? I've searched on xdaforums.com but only found instructions for the C.20 patch. I have no experience with rooting, and this is my only phone. Also, are there any suitable custom ROMs available, and I hope for detailed instructions to follow

kounosakura said:

Do you already unlock your bootloader

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Not yet, I haven't unlocked the bootloader