My question is weird, but here is it:

My background

I'm a native French speaker and a software engineer, I studied in a french speaking country and grew up there speaking French.

My Question is which language should I use for my technical blog posts?

On one hand:

French could be easier for me to write in It can allow me to make a difference by transferring knowledge from English to the French speaker.
Cons: much less audience and I always think that the beauty of computer science or technology can only be viewed in English.

On Other Hands English:

it's a bit harder for me to write a blog in (I have written 2 blogs in 6 months) and I'm afraid that not mastering the language could hold me back many times.
But with English, I could target much larger audience and improve my writing skills.
What do you think?
Ideas are welcome...