Underdogs who have been able to achieve success against much fancied opposition will readily agree with the statement,"it is better to be underrated by people than to be overrated by them". I also agree with the statement and the reasons are as follows:
This is well-done. However, this part
"it is better to be underrated by people than to be overrated by them"
sounds peculiar, as you don't rewrite it using your own words. I suggest that you paraphrase the sentence.
Lastly, during a competition, if you are underrated by the people or the opposition or both, you have a much better chance of winning because will not know of what you might be capable of. You could use those low expectations of you to beat the opposition; you could use it to your advantage.
It is always good to do the same action as you did in the paras 2&3, by giving real-life examples so as to support the topic sentences.
I believe being underrated is a big advantage, because then, you have nothing to lose but everything to gain.
The rule of a concluding paragraph is to write a concluding signal, to restate the thesis statement, and to develop strong recommendations, hopes, or to express deep fears.
Thanks.