Ask HN: Carrier advice, a bit confused

Little background. I am a three year experienced Python Backend dev. Currently I work for a start up that pays well. I am at crossroad currently. I am juggling couple of carrier choices but cant seem to decide which way to go.

Options

  1. Slog on LC and aim for BigN.
  2. I already know JavaScript and have built front 
     ends. Pick up React and along with Python 
     transition into a Full Stack dev.
  3. Take a plunge into Machine Learning.

I am unable to choose among the three. I would appreciate if you guys could critique each of the choice. I am really looking to a discussion over these three options. Thanks.