Time Travel: 2014

At the end of 2021, Lin Hui, an employee of a large factory, was fishing with his mobile phone. He was reborn without warning, a few days before the 2014 college entrance examination.
What can a tech nerd do after being reborn?
The answer is - do whatever you want.
Where can I go to the financial market to play with my heartbeat?
Submit some iOS vulnerabilities to get millions of green votes
Write a small game and easily earn tens of millions of dollars
Any bad algorithm from later generations can now be exchanged for an astronomical sum of money.
…
It’s great to know a little bit about technology, right?
Sorry, with technology you can really do whatever you want.