You have a wide spread of subjects which is good!! And don't stress I've heard of many people in similar boats, submit smth for the early-bird fee - you can always change later
Uhhhh the first things that spring to mind are the engineering side of things - biomedical, biochemical, I hear bioinformatics is increasingly becoming a thing
Pharmaceutical stuff might have scope, always need new drugs in this market (I mean the legal kind but you never know...)
Then there's all the commerce stuff but I'm not into that so I have no clue how that stuff goes