Upon digging deeper, I found that there was still data leaking from my storage from apps I'd uninstalled in the past. Related I found gigabytes of invisible junk on my Android that the default manager never shows I freed up gigabytes of storage on my Android in minutes — this free app showed me exactly where it was hiding. It specifically scans for remnants of data left by uninstalled apps, and the developer quite literally refers to this data as "corpse". Running CorpseFinder is a pretty straightforward process — you'll get a list of every junk folder left behind by apps you've removed. Usually, it's the built-up cache or the leftover data from uninstalled apps that isn't clear at first glance but can be cleared easily with a tool like SD Maid SE.