My opinion about a mall

The mall isn't attractive for clients. I think first of all this [you switch from 'the mall' generic, to 'this mall' specific, if you're going to change you have to clarify why]  mall is far away from the center and there aren't buses or trains to bring the people here [exclude 'here' unless you are talking at the mall] to the mall. Everybody needs a car to come the mall, and young people, like sixteen or seventeen years old, can’t drive. They need their parents for coming. [not 'for coming' but 'to come']

Besides the mall has a lot of shops closed [remember, in English, adjectives come before nouns, so like black pen and not pen black, so here 'closed shops' and not 'shops closed'] and the lighting is dim and sometimes the floor is dirty. The entrance isn’t adapted for people in wheel chair [people is plural, so wheelchairs, also, wheelchair is one word].

I think the mall needs a big change. It needs another shops, [another is for one more, maybe 'It needs more shops' instead] more restaurants, and a cinema to be attractive to the clients. I also think ['it needs' not just 'needs' because you changed the subject from 'I' to 'the mall' in the same sentence] needs a bus, which can bring people from the center. And with the clean of the mall [with the clean of the mall? I don't understand] I should [Should implies obligation, debo, I think you want to say, 'I would' put some plants to decorate the building.

Well written!