I’m sorry but I really need some help to explain this passage 😭🙏🏻 my questions in caption

*I obviously need way more work but I really need help here in breaking down. Sorry for the messy handwriting in my marker pen too 🙏🏻 sorry and thank u in advance to any one who is willing to help me🙏🏻

まったく言葉のわからない国… assuming it means when going to a country where I don’t know the language completely? Why is it 言葉のわからない instead of　言葉がわからない？

…で気持ちを表そうとする　I don’t understand this sentence – is it just means ‘I’ am showing my 気持ちfeelings thru drawings and gestures? Why is it 表そうinstead of maybe just 表します and why is there a とする？　

…繰り返し聞く　- repeat hearing? The other person tries to hear/listen to it a few times? So is it also saying “I” say something repeatedly to the other person?

… わかろうと勤めれば　the ば here is hypothetical/if situation right? So is it trying to say if each other/other person tries to understand? Then they will say […] (next sentence?) わかろう　like let’s understand it together? does と mean ‘and’ here?

… ぐらいのことは通じるものである　is it trying to say that these are the only ‘things’ that can communicate if they try to understand each other? Why is it 通じるもの instead of just 通じる？　

The first option – 理解しようとすれば　why is itしようとすれば？