What Should I Do To Become A Mathematical Genius?

No need to be born with a genius mind, its depends upon your will power determination and love for the subject maths

The more you solve the sums the more you get experiences and make you become a genius.

Well then, There's something wrong with you and your PhD if you think that way. People born with nothing special but screaming. After while they become familiar with the concept of learning new things through out what life has to offer. Mostly humans learn things by attention.

I used to suck at math but now am doing very well
practise practise practise
and soon ull be doing very well

Nothing is impossible and it is commendable that you should want to excel in a subject that gives many nightmares. Math is a subject that involves application and reasoning power. Carl Friedrich Gauss rightly referred to the subject as the 'Queen of the Sciences'. And, a royal subject it is. To become a mathematical genius, you need to first identify the areas of application that hold you back from scoring those marks that are desired. Once you identify them, look around and check out the resources available to address the problem areas.

There are a number of resources available online and otherwise that offer dedicated help in the subject. The resources help understand the spheres of algebra, geometry, statistics, trigonometry, calculus and more. To excel in Math you need to practice the problems extensively and keep inviting new challenges. The more you apply the better will you get at the subject. You should take on mental math problems and time yourself. Another tried and tested method to consider is one known to have been adopted by the geniuses in the subject: Attempt creative solutions to problems, rather than use rules learnt by rote. If you stay focused there is nothing that can keep you from becoming a math genius.

Pratice, Pratice, Pratice, makes the perfect since. There are different areas of math. Start with the one you are most interested in advancing   in and go from there whether it be geometry, trig, or weights and measures, etc.
However some people have a niche for doing certain things well, but nothing is impossible if you just try your hardest and pratice at it daily, and stay focused on what you are trying to accomplish and you will reach your goal of being a mathematical genius.

This is all ridiculous. A mathematical genius is someone who, due to their ability to solve problems incomprehensible  to the normal or even world class mathematician. Mathematical geniuses are generally only considered one once they have the ability to prove multiple unsolved problems in the mathematical world. Hence it take a lot of natural ability to think outside the box and make the rest of the people here on earth feel stupid. You can work to be excellent but you must be born with some sort of a brain enhancement which gives you a uncanny ability to do math to be a genius!

Practice, Practice and Practice.