The Dollar's fallFall of the Dollar

This is more idiomatic

The Dollar's fall took by surprisefall of the dollar took by all the investors who have been working on wWall sStreet during the last few months by surprise.

Old guys in the industry and someIndustry professionals and certain important economists have foreseen that dollar are able tocould fall even morefurther.

“Some” as a determiner for a singular noun sounds very informal.

The upheaval behavior of the currency canould bring important changes to the world economy of the world and even could redefine which will be new powerful countrieshow power is situated globally.

“Upheaval” is not an adjective.

You could also write “redefine which countries are powerful” or “which counties hold the most power globally,” but I think this version is more elegant.

China seems to be the main competitor of the United States in this timethese days, which is a pity because iI don't want to learn mMandarin language and. It could be even worst,e: China haves one of the most repressive way of government that today exists and backwardss in existence today, and developing countries usually tent to emulate or use the same political structures of the developed countries.

The original sentence had too many connecting conjunctions. A longer sentence is fine, but when introducing a new topic, as you implicitly do so with “it could be even worse,” it’s best to just start a new sentence.

I would rue toegret liveing in a world with a restricted freedoms, and today our freedom is threatened by countries like cChina or some others Asiaticn economies, b. Because of that i, I decided not to buy Huawei anymore, because I want to defend my freedom and I can’t use gthe Google pPlay sStore ion Huawei phones and t. That is even more disgusting than loseing my rights.

Take care to avoid run-on sentences: independent clauses or ideas should generally not be separated by only a comma. The comment that I had before about conjunctions also applies.

The Dollar's fFall

In English, the first letter of every noun, verb, pronoun, adverb, etc., must be capitalized in the title.

The Dollar's fall took by surprise all the investors working on wWall sStreet by surprise during the last few months.

Old guys in the industry and some important economists have foreseen that dollar are able towill (?) fall even more.

While "old guys" is grammatically correct, it doesn't really make sense here unless you're actually referring to senior citizens (at least that's what first comes to mind), you might want to use a word like "experts" or "experienced professionals" instead.

The last part of the sentence doesn't really make sense. "Foreseen" implies that the action is almost inevitable, while "able to" implies that there's a chance, so they present to conflicting ideas.

The upheavaldisruptive behavior of the currency canould bring important changes to the world economy of the world and even could redefine which will be new powerful countriesand could even redefine which countries are powerful.

China seems to be the main competitor of the United States in this timesright now, which is a pity because iI don't want to learn mMandarin language and Id, as if it could be even worst, China haves one of the most repressive way of governments that today exists today and backwardster (?) countries usually tentd to emulate or use the samimitate the political structures of the developed countries.

I would rue torue the day that we live in a world with a restricted freedoms, and even today our freedom is threatened by countries like cChina or some others Asiaticn economies, and because of that iI decided not to buy Huawei anymore, becauseas I want to defend my freedom and I can't use gthe Google pPlay store ion Huawei phones, and that is even more disgusting than loseing my rights.

"That is" is often written/said as "that's".