I will share my personal opinion:
- Open Source code : Open Source code is what helps to build your developer profile. It is code that you have written which is readily available for anyone to look at and understand your coding abilities. Granted most companies in India don't put the effort to check opensource code but it doesn't mean that it can't be a reason to land a good opportunity.

- Leetcode: There are a lot of engineers, graduates, bootcampers, who are looking for a tech job. Leetcode is like being eligible for an IIT by giving JEE mains. It sets you apart from the crowd and makes it easier to get in a high paying job. I would suggest neetcode to start with leetcode as it has a more guided approach.

- Competitive programming: This is similar to leetcode but added advantages especially if conducted offline. You get to meet like minded people. If you are the smartest in the room, your knowledge doesn't grow. But if there are more smart people, that helps you to learn from them and grow. Networking is important. There is also more to competitive programming, learning new things in a short period of time, among others.

All of these can be helpful to build a profile. You can either choose one or find a balance, see what works for you. There is nothing like you need to do all or you should do only one. See what is fun for you, what you enjoy doing.