You cannot 'convert' W10 32 bit to W10 64 bit, but you can clean install W10 64 bit.
You would have to reinstall all of your programs and files with a clean install.
If your PC supports 64 bit operating systems, and you had previously upgraded from W7 32 bit to W10 32 bit for example, you can clean install W10 x64 by making bootable 64 bit installation media using the media creation tool at the link below.
If you are asked to enter a product key during the installation process, select the 'I don't have a product key' option, and W10 will install and automatically activate once you are connected to the internet.
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