How can I improve my extracurriculars?

Try to get a leadership role in something. Leadership is what colleges really want to see so hook yourself a spot as one. Also try starting a club or group of some sort which will enhance your EC's even more.

Try to do some volunteering in your community as well with strong hobbies. Colleges love to see that your taking time to volunteer and put some hours into the community. They also love that you have personal interest with your own interest. Working with fundraisers would definitely help your EC's.

In my opinion, opportunities that show your educational ability, such as competitions or summer programs, will really help round out your profile.

you can check out roundpier - it is a great extracurricular community

Volunteer work, leadership, and academics are always good areas to target with EC improvement.

I think that it's better to choose the most interesting filed for you to get some achievements. For example, to win some sports competition or something like that. It should work

Personally i would try to continue the work related one, try to get a managerial position or become a trainer. I would go they same thing with the others maybe try to get a position of authority like planner, president etc.

You don't have to put just things sponsored by a school as an extracurricular. You could put hobbies that you spend a decent amount of time on as well. Work experience helps as well. Colleges want to see really well rounded students.

You can take part in Olympiads and get extra points