Computer Saving and Downloading Paths after Home Directory Rename and Change Misconfigured

After initially resetting my old MacBook Pro for selling I had created an arbitrary username and login settings; which, after finishing initial set up, had created a home directory under that username. Unaware that I may have kept it, I decided to change the username/home directory to match.

This implemented a restart and after that restart I had noticed that all my downloads: Apps, things from all internet sources, and certain pre-installed apps, began to install directly into the partition I created for MacOS only, and were not available on the rest of the free space on the SSD or the separate HDD. I noticed that this made accessing some pre-installed Apps impossible, and when I was downloading anything beyond capacity of the small partition space, I could not download anything to the SSD or HDD wasting the majority of space and allowing essentially nothing to be installed on my computer.

Noticing this, I tried reverting to the exact old username/home directory, and this issue still occurred. It doesn't seem to want to revert itself. I have tried multiple changes, reverts, and so on, but no luck. Also I notice that I cannot enter Recovery Mode on my Mac to even reset the whole thing.

Could this all be due to certain booting or directory glitch all combined?