I find that even if you do not have <something >(anything) interesting to write [or "any interesting thing to ..."], you can still practice your writing,< even> by writing <on >(about) commonplace and mundane things.

Well, this will be a mundane one. [Now you are using "well" appropriately because of context. A hesitation for dramatic effect.]

I <will >(shall) try to describe how I packed< my stuffs> [there is no plural for "stuff". It's already a collection of things] and prepared for <the >(my) returning( home )tomorrow. [I knew you are going home in your previous entry :). Bon voyage]

Yesterday, I slept at around 4(am)< p.m.>.. I stayed up late (to) surfing the Internet and watch<ing >Youtube videos.

Have to admit that it is quite easy to become addicted to those hilarious talent show auditions. I know it is bad to laugh at others. However, I think it is just fine <as well as >(if )you do not do it openly< and> (or) publicly. Also, these talent shows are meant for entertainment( purposes only). So, if anyone decides to audition< for talent shows>, they <have to> (should be) prepared to be laughed at by the audience. [I prefer, "they should be prepared to be made into fools by the audience"]

Am I not right? Haha. This is what I always speak to myself to reduce the( my) guilt. [or "any guilt of mine."]

The next day, I woke up <at> around 11 o'clock. After breakfasting, I rolled up my sleeves for< the >packing< job>.

Before (anything else) <that>, I <had>( have )to prepare the boxes. I had to <"construct"> (revert/reconstruct the flat pieces)< the boxes >back into their original shapes.< For the purpose>, (Also )I <had>( needed) a pair of scissors, a <indelible >marker pen (for making indelible markings, )<a> paper <tape> and <a> plastic tapes. <Firstly, I sealed >The bottom of <one of >the boxes (must be) (reinforced /secured) with the plastic tape.< Secondly, I >(and finally sealing)<ed its> (the) bottom <again with the plastic> (more paper) tapes to cover<ing half of >the left and right parts of the first plastic tape.< After finishing the box, I continued with the other two, one by one. >(Two more repetitions with the other boxes and I was done!)
)<Done! >

Now, it is the time to put (my stuff into them; each containing mainly food, bags and books. )<the stuffs into the boxes. The three boxes were mainly for food, bags and books respectively. >

(When all is done, the top is now sealed with a paper tape instead so that I can write my name and address on it. There is a storage space allocated for student belongings at the end of the corridor. The third box will join its two other siblings tomorrow after I had bid a temporary farewell to my friends.)

[You had used this trick before. Too many is no good and its effect will be lost] I think it is time to put an end to this boring entry as <the writer >its author himself <now >cannot endure (anymore of this writing)< the >agony <of writing it.>

I just add some small changes for keeping the entry in text fileformat.

I have some questions about how to pack, I will write it  later.