How to upgrade your skills?

If you have attended lots of courses, but you still feel that they were not enough, especially those courses were not very practical, they were theory or lectures, so what will you do to gain real practical skills. You can answer according to your feild ex: engineering, medicine or nurse.. all need practical skills. How to improve it and how to find someone to teach you , adopt you till you become a master? I have tried to offer some money to teach me in their place or giving gifts , but they were not enthusiastic to train. So what to do pls?,
How to upgrade your skills?
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