Hi, of course you need to start your paragraph with self introduction first
Now for your paragraph:
I have a Master's degree in Applied Mathematics and an estimate of thirteen years of experience specializing in Business Analytics and Customer Experience Management for some of the biggest financial and telecommunication companies in Russia. After my family had moved to the USA, I began learning English and decided to expand my experties as Math Teacher.
While enjoying teaching maths tokids, I realized how much driving the process of problem-solving is for me. I miss the challenges, high-speed dynamic, and teamwork insights I used to have at my work before. Learning new things is an incredibly joyful experience, and I'd like to use my full potential to discover The Data Science field and take the next step towards a new stage of my career.
Ok now your paragraph is grammatically flawless and i changed few details to what i think sounds better, good luck!