A hundred and thirty one posts, and the handful written in Bulgarian are the ones with a reader in mind. The rest is rewritten marketing material, produced in bulk, with the odd phrasing that comes from software passing over a sentence: the digital globe, the advertising arena, techniques that intensify sales.
If you read English as a second language that awkwardness is not fatal, and the underlying advice is standard and mostly correct. Keep subject lines short and friendly. Use somebody's first name occasionally. Watch which punctuation trips a spam filter. Test one line against another instead of guessing.
The Bulgarian posts do something the rest cannot. They explain the business to people who could not read the English version at all, and one covers a subject with no connection to marketing whatsoever.
Vladi Vasilev built a library rather than a blog. Search it for the topic you need, read one article, and go. If Bulgarian is your language, start with those posts instead.