What Should Mitali Write Next?

For the first time in years, I'm not writing under contract. It's an exciting, creative space. I'm planning my writing time for the coming year, and I need your help. I've got four unwritten projects on my mind. Which one should I tackle first?
  1. YA Bollywood-esque action novel with a funny guy hero. Theme: international adoption and power.
  2. Short novel for elementary-aged readers set in Nepal about wells, water, and arsenic. Theme: do good well (no pun intended.)
  3. Picture book fairy tale featuring a South Asian boy prince and his love for Bengal Tigers. Theme: overconsumption versus conservation.
  4. YA novel sequel to SECRET KEEPER set in the 1990s featuring Reet's daughter. Theme: following your bliss and battling college pressure.