I think bilingual is more convenient than monolingual. There are two reasons.
First, people may be able to speak the language which is used in the country when people visit a foreign country. For example, when they buy something, they can tell what they want easily.
Second, when they are asked something by foreign people, they can answer it. In doing so, they can help someone who has troubles.
For these reasons, I think bilingual is better than monolingual.

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Your sentences are awkwardly worded. In an essay, it is important to avoid awkwardly worded sentences because it can confuse the reader. You also have to write in a more formal way. For example:
“In my belief, being bilingual has more benefits and is more convenient than being monolingual. There are two reasons for this.
The first reason is that people can speak the language in the country that it is used in. An example would be when they buy something from the supermarket. They can ask for what they want without any complications.
Secondly, they can answer questions when being asked directly by a foreigner. In doing so, they can have better connections with people.
In my opinion, these are the main reasons why being bilingual is more beneficial than being monolingual.
I would completely erase the “ help someone who has troubles.” I hope this helps!