Yes, biodefence is a solid shout. My instinct would be to follow the money - places where the cash is flowing but the storytelling is still playing catch-up.
Climate tech with a proper science backbone, for instance. Carbon capture, grid-scale storage, geothermal, battery recycling. Loads of decks, tonnes of funding, hardly anyone who can explain it to a regular person without sounding like a grant application.
Bio plus data is another one - synthetic biology, lab automation, AI in drug discovery, personalised medicine. The people in it are brilliant, but the copy is mostly unreadable. If you can turn 'omics' into 'here's why you should care', you're gold.
Then there's government and defence-adjacent tech - not the generic cyber stuff, more dual-use tech, drones, space situational awareness, ISR. Huge money, but the writing is either PR fluff or impenetrable mil-speak.
And regulated fintech - infrastructure, payments plumbing, compliance tools, B2B stuff in emerging markets. Cash rich, explanation poor.
Basically, anywhere VCs and governments are throwing money at acronyms that nobody's mum can understand yet. Who's going to translate all that?