Which country was the best and in what respect?

I have been to almost twenty countries forin the past two years.

Unfortunately, I haven’'t travelled any countrieoverseas recently because I have to work.

I miss going on (new) trips and meeting new friends.

Please, imagine !

When you arrive in a new country, you hear different sounds and look different from many people.

You might be excited or terriblefied.

How can I get to tohe city center?

"Go" and "get", while similar, are two different actions. To go is to head towards the city center, while to get there is to actually arrive at the place. The challenge lies not in going there, but rather getting there. For this reason, "get" seems more natural to me here.

Which bus is goinggoes to my hotel?

I miss it all… ¶
I tolsaid that I've travelled to twenty countryies.

"Told" must be followed by an object.
> I told that I was going out. ❌
> I told HIM that I was going out. ✅

Now, I am talking about theose countries.

"Those" strikes me as more appropriate here, since you're referring to the previous time you mentioned the twenty countries, which was quite a while ago all the way at the start of the text.

I think the best natural countcountry in terms of its nature and scenery was Switzerland.

It might be unclear what you mean by a "natural country".

I have been to Zurich, Interlaken, Lauterbrunnen, Lungern, Luzern and Basel.

I have felt at peace and relaxed.

The phrase is "feel at peace" or "feel peaceful".

Switzerland is famuous for its trains.

These trains usually go torun on a wonderful route asnd are known as the Bernia Express.

I realized life was continuingthere progressed slowly.

Added "there" for more clarity: you're referring to life in Switzerland specifically as opposed to life in general.

People don’idn't care about theirs futures because there wasn’t anything bad vibe for themy didn't feel bad about it.

(1) "Theirs" is used when it is not followed by a noun. Otherwise, we use "their".
> This pen is theirs. ✅
> This is their pen. ✅
> This is theirs pen. ❌

(2) The second half of the sentence is awkward, so I have altered it slightly.

EThe economy is (doing) very well.

I think the best responsible country icountry in terms of its history and culture was Austria.

(1) It is also unclear what is meant by a "responsible country".
(2) Keep the tense consistent. When introducing Switzerland, you used the past tense (which is correct), so you should use "was".

I don’t like visiting museums, but there were many important museaums in this country.

You should go to Hallstat with daily tourson daily tours in Hallstatt.

Restructured the sentence so that it sounds clearer and a little more natural.

I think the best old builds countries acountries with the best historical buildings were Belgium and the Czech Republic.

WhenIf you comego to Belgium, you should definitely visit Brugge and Ghent.

(1) "If" might be more appropriate here, as "when" makes the assumption that the reader will go to Belgium.
(2) "Come" implies that you are writing this in Belgium. If you are not in Belgium, you should use "go".

I think the best colorful and funnyfunniest and most colorful country iswas the Netherlands.

I shifted "funniest" before "most colorful", because it sounds more natural this way. Writing "most colorful and funniest" might suggest the phrase "most funniest", which is an awkward expression.

Netherlands peopleers hate it.

I have tried nice cheeses there.

Adding the "there" might make the sentence clearer.

There were canals and old buildings in Amsterdam.

You should definitely geto on a canal tour and visit Red Lthe red-light district.

"Red-light district" is not a proper noun, so it shouldn't be capitalised as such.

Don’t trust to girl in there.

I am not sure what you meant by this sentence. Perhaps you can provide the native text in a comment?

The bemost interesting buildings were in Italy.

PeoplThe locals there were similar to Turkish onespeople.

(1) In this context, I wouldn't suggest using "ones" to refer to people because it seems quite odd. It might even appear to be a little dehumanising.
(2) I replaced "people" with "locals" because I want to use the phrase "Turkish people" without repeating the word "people".

I have visited Venice, Florence and Touscanay.

To me, the present perfect tense ("have visited") doesn't seem very appropriate in this sentence, because you'd already established that you're writing about Italy before this, in which case you can just the simple past tense to narrate what you did. Compare this to the next sentence, where it's your first time establishing the topic as "other European countries".

I have also visited other Europaean countries.

Hungary, Slovaenia, Slovakia, Greece, Denmark, Germany… Thanks for reading !