I’m not an expert in this topic but I am an IB2 student who just finished their History EE. I do think it is too broad, so I would suggest do some broad research and then focus on either asia or europe, definitely not both! Once you get more in depth into the research find a specific area that they had a lot of influence on, economically, politically, on a later conflict in the region etc so that it isn’t as broad anymore. For now, don’t worry about it too much yet and really take your time to pick a good research question and topic. Always go talk to your supervisor or history teacher if you’re stuck on something they can definitely help. Also remember from day 1 on to write your sources somewhere so you know what to reference later on in your final bibliography. History EEs usually have 20-30 sources minimum so make sure you do extensive research and write it down otherwise there is gonna be a problem at the end when you can’t find them anymore. Hope this was helpful!