It should be about your lack of imagination and desire for meaningless trophies, and how the great game of chess helped you to overcome these issues and grow as a person.
I have no idea what I'm doing

*cough* *cough* (Says the person who has 70+ awards) *cough*
BUT ANYWAY, (sorry not trying to be mean) I actually enjoy getting trophies like in games an every thing(especially the secret/hidden ones). Anyway, I decided I would make it about horde because I'm good at it. It's so far has 31 views.
Holy cow you're good at chess. I suck at it.

It should be about your lack of imagination and desire for meaningless trophies, and how the great game of chess helped you to overcome these issues and grow as a person.
A good start, but I'm not sure I like the Pollyanna ending.
How about :
1) Lack of imagination and desire for meaningless trophies.
2) An encounter on the discussion forum with a pair of jaded, cynical chess experts, who opened your eyes to the essential futility of digital trophies and virtual achievements.
3) Days of brooding introspection, gradually spiralling into depression and drunkenness.

Good, I like the 'drunkeness'. I suspect the OP is not yet of legal age to consume alcohol so this also has the added advantage of setting a long term target to achieve.

I wanna make a blog to get a trophy but I don't know what to make it about.
What should it be about?
So basically you're writing a blog for fake internet points?

I wanna make a blog to get a trophy but I don't know what to make it about.
What should it be about?
To offer a slightly more serious answer... you could write it about the idiots you encounter in the forum on an almost daily basis.
I wanna make a blog to get a trophy but I don't know what to make it about.
What should it be about?