Well,for a start that tablet only appears to have 2Gb of RAM, so installing a 64-bit OS seems a bit pointless--have you tried just using a 32-bit version? Admittedly, for Linux Mint that would require you to download 19.3 because it was the last version available as 32-bit--you could get a fully up to date 32-bit distro by getting Debian, which is the one that Ubuntu, Mint and their ilk are ultimately derived from, but Debian does have a reputation (well-deserved, from what I know) of being awkward to set up and configure.

Oh, and I assume you already tried disabling Secure Boot in the tablet's BIOS?