My world has a problem is that it does not have the portal at the end

My world has a problem is that it does not have the portal at the end, I find the Fortress but it is very very small and the portal is not there and then I took a copy of my world and I got creative and looked for it and I did not find anything until everything exploded to find it and I did not find it, the seed is -917608838, if you can solve it please pass me the coordinates, thank you my name in the game is Axelinsito14, and I would like you to help me because I have a lot of time with that world and in that world I want finish minecraftt