I have the best solution to resolve your issue regarding the conversion of Vcard to CSV. It`s my personal experience working with this tool which was suggested to me by one of my professional friends. You may use Free Vcard to CSV Converter.
See here:- httpshttps://www.mailvare.com/free-vcard-to-csv-converter/
VCF to CSV converter is very easy tool in which you can convert VCF to CSV format easily . it can converts all size VCF files into CSV format very smoothly , you can save the data in your desire location , you do not required any technical help for use it, you can try this utility.