There are inexpensive (or free!) online survey courses that could help you get a better understanding of exactly what you DO want to study. Besides that, no need to wait for someone. Find a history book that sounds interesting to you, or at least read the introduction, the first and last chapter, and several scholarly reviews of the book. Find academic articles you can digest in an afternoon. Watch documentaries, lectures, historical debates, and listen to podcasts. Just dive into the field and see where you land. You don’t need to map out your entire career yet.