Proof of the Messiah’s Role?

I am struggling with Judaism and Christianity on the role of the Messiah. I have been taught that the Messiah is not some divine figure, but a righteous leader who will castigate nations for their treacherous ways and resolve their conflicts. (Isaiah 2:3-4). After studying the entire New Testament thrice, it is hard to see the compatibility of Jesus life with this role, as during the first century, no peace was acquired, nations continued to war against each other, and etc. The book of Matthew particularly makes claims that the Jewish prophets foretold of Jesus’ role. **What prophecies or scriptures do you guys think are the most evidently clear in order to help me resolve my “incompatibility” issue?** I am looking for scriptures ONLY from the Old Testament with reason as to how this applies ONLY to Jesus’ life. (I would appreciate even the most common scriptures such as Isaiah 7:14 and why you think these scriptures confirm that Jesus had to come, die, AND resurrect for us to have an eternal relationship with our Creator). I hope my question is clear, I have been fed too much information from both sides it’s hard to juggle it all. I will be researching similar questions on the Jewish stack exchange and conducting comparative analyses on the role of the Messiah.