Before writing a conclusion, you must completely finish with the introduction and the main part of the essay. Read what you got. If the topic in the main part is not sufficiently disclosed, finalize this point.
Proceed to the conclusion. Read the work again. Write down your main thoughts on a separate draft. If the essay is written on a draft, the main thoughts can be indicated on the margins with a pencil in front of the corresponding paragraph.
Now work with the recorded thoughts. Read them. You can simply reformulate them using other words and following a logical sequence.
A variant is possible when on the basis of the selected basic thoughts of the work it is possible to construct more generalized conclusions. This option is more complicated, but more creative and interesting, and also the most advantageous from the point of view of the evaluation of the composition.
Remember that the task of conclusion is to generalize your thoughts and focus on the most important, and also to summarize the reasoning.
In conclusion, the attitude of the author to the topic or problem posed should be reflected. However, the essay should not contain too enthusiastic words or a sharp negative evaluation of the negative sides. Try to clearly and concisely prove your position.
Keep within the declared amount of imprisonment, but do it organically. That is, remember that the conclusions should be informative, without excess water, it is necessary to link with the main part and the logical sequence of the presentation.