This is an important question. Let me give you a few points that might help you in creating a good conclusion.
First, as you state, you want to restate your thesis in your conclusion. The reason for this is that you want your reader to know that you proved your thesis in the paper and did not leave the topic. Moreover, you do not want to introduce something new. If you do this, your reading might forget what you are writing about.
Second, variation is the key to restating your thesis. In other words, the best way to restate your thesis in the conclusion is through creativity. You do not simply want to restate your thesis, but you want to restate it in a way that will leave the reader with something extra. Think of creativity and closure. We need to keep in mind that that the conclusion is the last thing a reader reads.
I was writing a persuasive essay about how teachers should lessen the amount of homework they give kids per night. This was my thesis, Teachers should lessen the amount of homework they give a student because of the effects such as lack of sleep, large amounts of stress, and children becoming lazier. Can you give me a conclusion to get an idea of how to create it?