My Endroom didn’t spawn in my stronghold

So my Endroom didn’t spawn in my survival world which I spent over +100 hours on. Right now I’m trying to get every achievement and beating the Ender dragon is a big one. But when I found out I might not for a long time I got sad. If there is anyway you can make it so I can get the end frames and still be in pure survival that will be awesome thank you for your time.