"Now, I decided to give it a shot in another language" and "may I ask you to subscribe to my blog's newsletter or its RSS feed? They are both on site's footer." both read non-native to me; I'd expect a native to say "Now, I've decided..." and "They are both in/on the site's footer".

But I agree with everyone else that rpgbr's English is excellent, more than adequate to publish English-language journalism. It is extremely difficult to get all the details of a foreign language right every time, and in most cases it's not a standard worth reaching or worrying about.

(And if you do worry about it... practice is the best way to get there.)