Random comments - make your own assessment as to their value ...

Get a part-time job now flipping burgers or waiting tables. Use that to stretch your deadline a month or three. Continue to consider the "startup" as a genuine potential future job, and find a way in the next two months to get some money - any money - coming in from that.

If you continue to be serious about the startup, why are you living in London? that's got to be more expensive than other options. Are you renting? Do you own the house? Are you sharing? Are you living with your parents?

What is your degree? Consider doing some Project Euler problems in both Python and C#. Compare and contrast. Don't spend too long on them, but a solid range of worked solutions tells potential employers that you can code and solve problems.