Chosen Solution
I need more space on my computer
Chromebooks are somewhat notorious for lack of upgradability, and yours is no exception. 64GB is the largest memory option offered for that laptop, so you’re already at the maximum. The eMMC memory used as the ‘hard drive’ is soldered to the motherboard and is not considered upgradeable. Even if you could find a pin-compatible memory chip replacement that had more storage and were able to successfully unsolder the old chip and replace it, there’s no guarantee the operating system would recognize it; that would be a crapshoot as to whether it would or not. Your only other option is to make use of the microSD card reader; you should be able to add more storage by inserting a card.