Clutter
Clutter
[There is a panel containing a line graph. The x- and y-axes are labeled "time" and "amount of stuff in my house" respectively.] [The y-value generally increases straight-line as x increases. There are a few labeled exceptions where the y-value decreases slightly but instantly increases again. From left to right:] "I need to clean up." "I've really let junk build up. Feels good to clear it out." "I hate moving, but at least it's a chance to finally get rid of all this excess stuff." "Ah, spring cleaning!"
[Caption below the panel:] I'm starting to worry about my strategy for dealing with clutter.

As the graph shows, the amount of junk sitting around Randall 's house is on an ever-increasing trend. Thus, it will continue to pile up and cause problems.
Randall cleans up sometimes, thinking that he is returning to the same baseline amount of stuff each time, but it is not actually effective enough to keep up with the cluttering trend, and hence his worry.
The four places on the graph where the amount of stuff decreases reference common times when people clean up and get rid of junk or excess stuff.  This includes:
Although not mentioned in the quotes, it is also common in the United States to clean up and donate items (for instance to Goodwill) on December 31st, right before the New Year, to gain the charitable donation benefit on their taxes for that year.
The title text refers to the book The Life-Changing Magic of Tidying Up: The Japanese Art of Decluttering and Organizing by Marie Kondo . The main concept of the book is that one should gather all belongings and only retain items that "spark joy". Ironically, the thought of reading the book didn't spark joy for Randall so he decided to donate it.  Thus, one of the few things that he did get rid of was something that if he had kept and put into practice could have helped him actually reduce his clutter.
[There is a panel containing a line graph. The x- and y-axes are labeled "time" and "amount of stuff in my house" respectively.] [The y-value generally increases straight-line as x increases. There are a few labeled exceptions where the y-value decreases slightly but instantly increases again. From left to right:] "I need to clean up." "I've really let junk build up. Feels good to clear it out." "I hate moving, but at least it's a chance to finally get rid of all this excess stuff." "Ah, spring cleaning!"
[Caption below the panel:] I'm starting to worry about my strategy for dealing with clutter.
