I'm a simple person. I don't say: ". Write this or another way, created about 300 variants to say "hello", and only after that write me. Communicative patterns don't irritate me, so you're absolutely ok!". (?)

Simple person-это типо не очень умный, лучше plain person

Good to know.

I’m just a plain person. I do not insist for you to write in some particular manner or another. Try to be inventive, come up with 300 way of saying “hi” and once you’ve done it then get in touch with me. I’m not annoyed with various speech patterns, so you’re totally fine.(?)

Евгений, not bad! Here are some suggestions: (1) A plain person is a nondescript, boring person. SIMPLE is better in this context. (2) INSIST is followed by a THAT-clause with a subjunctive: “I insist that he go tomorrow.” (3) ONCE YOU’VE DONE IT (*THAT) is grammatical, but it’s a bit of a stretch here when you can simply say ONLY THEN (followed by inversion). (4) ANNOYED WITH is used to mean ANGRY AT. Here it’s better to use irritated/annoyed BY. (5) YOU’RE TOTALLY FINE is perfect 👌🏼

Also, 300 wayS...

Ok thanks Uly! But I’ve always thought that a SIMPLE person is somebody not very smart)) And how about using a REGULAR person or DOWN-TO-EARTH person?

You’re welcome)) When you mean that you’re not a pretentious, uppity person who expects a lot, you say “I’m a simple man.” Context is everything and in this context we use “simple.” In another context, we just “REGULAR guy/joe” meaning that you’re not rich or famous by any means, and you’re not pretending to be.