How to gather more skills in web development sector?

I am Pranab Halder Partha. I am from Dhaka Bangladesh. I have completed my full stack web development course.

Now I am a certified full stack web developer with more than one year experience in local and online marketplace. I have developed many responsive html theme by row coding and the framework and wordpress theme too.

Now I want to develop my skills.

How to gather more skills in web development sector ?