Using "there are" is not an incorrect way to write a sentence, but you don't want any phrase to be overused in your essay. In general, I suggest that you do not use the same word or phrase twice in any one paragraph. The best way to replace phrases like "there are" is to either put one of my sentence starters in front, or to reorganize the words in a sentence. Here are some examples, starting with the "there are" sentence and then variations:
1. There are two different solutions to this problem of trying to keep teenagers away from too much social media use: having them get a job and taking away their phone.
2. Two solutions to the problem of trying to keep teenagers away from too much social media use are having them get a job, and taking away their phones.
3. Taking away their phones can help solve the problem of trying to keep teenagers away from too much social media use and so can having them get a job.