I know you will have a list longer than the eiffel tower of features and updates you need to get through but;
From experience of working in Finance one area that is ripe for disruption is Personal Account Dealing. It takes an age, lots of paperwork and is inefficient.
Imagine if you created a fairly lite admin console that compliance professionals could sign up to. I as an employee of a financial services firm need to get sign off for every trade I make, as such I place a trade on FreeTrade, it’s then routed to Compliance to sign off on their Admin Console, Free Trade then Executes the trade automatically upon receiving compliance approval.